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/*
**********************************************************************
* Copyright (C) 2004-2012, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* file name: uregex.h
* encoding: US-ASCII
* indentation:4
*
* created on: 2004mar09
* created by: Andy Heninger
*
* ICU Regular Expressions, API for C
*/
/**
* \file
* \brief C API: Regular Expressions
*
* <p>This is a C wrapper around the C++ RegexPattern and
RegexMatcher classes.</p>
*/
#ifndef UREGEX_H
#define UREGEX_H
#include "unicode/utext.h"
#include "unicode/utypes.h"
#if !UCONFIG_NO_REGULAR_EXPRESSIONS
#include "unicode/localpointer.h"
#include "unicode/parseerr.h"
struct URegularExpression;
/**
* Structure representing a compiled regular expression, plus the results
* of a match operation.
* @stable ICU 3.0
*/
typedef struct URegularExpression URegularExpression;
/**
* Constants for Regular Expression Match Modes.
* @stable ICU 2.4
*/
typedef enum URegexpFlag{
#ifndef U_HIDE_DRAFT_API
/** Forces normalization of pattern and strings.
Not implemented yet, just a placeholder, hence draft.
@draft ICU 2.4 */
UREGEX_CANON_EQ = 128,
#endif
/** Enable case insensitive matching. @stable ICU 2.4 */
UREGEX_CASE_INSENSITIVE = 2,
/** Allow white space and comments within patterns @stable ICU 2.4 */
UREGEX_COMMENTS = 4,
/** If set, '.' matches line terminators, otherwise
'.' matching stops at line end.
* @stable ICU 2.4 */
UREGEX_DOTALL = 32,
/** If set, treat the entire pattern as a literal string.
* Metacharacters or escape sequences in the input sequence will be
given
* no special meaning.
*
* The flag UREGEX_CASE_INSENSITIVE retains its impact
* on matching when used in conjunction with this flag.
* The other flags become superfluous.
*
* @stable ICU 4.0
*/
UREGEX_LITERAL = 16,
/** Control behavior of "$" and "^"
* If set, recognize line terminators within string,
* otherwise, match only at start and end of input string.
* @stable ICU 2.4 */
UREGEX_MULTILINE = 8,
/** Unix-only line endings.
* When this mode is enabled, only \\u000a is recognized as a line
ending
* in the behavior of ., ^, and $.
* @stable ICU 4.0
*/
UREGEX_UNIX_LINES = 1,
/** Unicode word boundaries.
* If set, \b uses the Unicode TR 29 definition of word
boundaries.
* Warning: Unicode word boundaries are quite different from
* traditional regular expression word boundaries. See
* http://unicode.org/reports/tr29/#Word_Boundaries
* @stable ICU 2.8
*/
UREGEX_UWORD = 256,
/** Error on Unrecognized backslash escapes.
* If set, fail with an error on patterns that contain
* backslash-escaped ASCII letters without a known special
* meaning. If this flag is not set, these
* escaped letters represent themselves.
* @stable ICU 4.0
*/
UREGEX_ERROR_ON_UNKNOWN_ESCAPES = 512
} URegexpFlag;
/**
* Open (compile) an ICU regular expression. Compiles the regular
expression in
* string form into an internal representation using the specified match
mode flags.
* The resulting regular expression handle can then be used to perform
various
* matching operations.
*
*
* @param pattern The Regular Expression pattern to be compiled.
* @param patternLength The length of the pattern, or -1 if the pattern
is
* NUL terminated.
* @param flags Flags that alter the default matching behavior
for
* the regular expression, UREGEX_CASE_INSENSITIVE,
for
* example. For default behavior, set this
parameter to zero.
* See <code>enum URegexpFlag</code>.
All desired flags
* are bitwise-ORed together.
* @param pe Receives the position (line and column numbers)
of any syntax
* error within the source regular expression
string. If this
* information is not wanted, pass NULL for this
parameter.
* @param status Receives error detected by this function.
* @stable ICU 3.0
*
*/
U_STABLE URegularExpression * U_EXPORT2
uregex_open( const UChar *pattern,
int32_t patternLength,
uint32_t flags,
UParseError *pe,
UErrorCode *status);
/**
* Open (compile) an ICU regular expression. Compiles the regular
expression in
* string form into an internal representation using the specified match
mode flags.
* The resulting regular expression handle can then be used to perform
various
* matching operations.
* <p>
* The contents of the pattern UText will be extracted and saved.
Ownership of the
* UText struct itself remains with the caller. This is to match the
behavior of
* uregex_open().
*
* @param pattern The Regular Expression pattern to be compiled.
* @param flags Flags that alter the default matching behavior
for
* the regular expression, UREGEX_CASE_INSENSITIVE,
for
* example. For default behavior, set this
parameter to zero.
* See <code>enum URegexpFlag</code>.
All desired flags
* are bitwise-ORed together.
* @param pe Receives the position (line and column numbers)
of any syntax
* error within the source regular expression
string. If this
* information is not wanted, pass NULL for this
parameter.
* @param status Receives error detected by this function.
*
* @stable ICU 4.6
*/
U_STABLE URegularExpression * U_EXPORT2
uregex_openUText(UText *pattern,
uint32_t flags,
UParseError *pe,
UErrorCode *status);
/**
* Open (compile) an ICU regular expression. The resulting regular
expression
* handle can then be used to perform various matching operations.
* <p>
* This function is the same as uregex_open, except that the pattern
* is supplied as an 8 bit char * string in the default code page.
*
* @param pattern The Regular Expression pattern to be compiled,
* NUL terminated.
* @param flags Flags that alter the default matching behavior
for
* the regular expression, UREGEX_CASE_INSENSITIVE,
for
* example. For default behavior, set this
parameter to zero.
* See <code>enum URegexpFlag</code>.
All desired flags
* are bitwise-ORed together.
* @param pe Receives the position (line and column numbers)
of any syntax
* error within the source regular expression
string. If this
* information is not wanted, pass NULL for this
parameter.
* @param status Receives errors detected by this function.
* @return The URegularExpression object representing the
compiled
* pattern.
*
* @stable ICU 3.0
*/
#if !UCONFIG_NO_CONVERSION
U_STABLE URegularExpression * U_EXPORT2
uregex_openC( const char *pattern,
uint32_t flags,
UParseError *pe,
UErrorCode *status);
#endif
/**
* Close the regular expression, recovering all resources (memory) it
* was holding.
*
* @param regexp The regular expression to be closed.
* @stable ICU 3.0
*/
U_STABLE void U_EXPORT2
uregex_close(URegularExpression *regexp);
#if U_SHOW_CPLUSPLUS_API
U_NAMESPACE_BEGIN
/**
* \class LocalURegularExpressionPointer
* "Smart pointer" class, closes a URegularExpression via
uregex_close().
* For most methods see the LocalPointerBase base class.
*
* @see LocalPointerBase
* @see LocalPointer
* @stable ICU 4.4
*/
U_DEFINE_LOCAL_OPEN_POINTER(LocalURegularExpressionPointer,
URegularExpression, uregex_close);
U_NAMESPACE_END
#endif
/**
* Make a copy of a compiled regular expression. Cloning a regular
* expression is faster than opening a second instance from the source
* form of the expression, and requires less memory.
* <p>
* Note that the current input string and the position of any matched text
* within it are not cloned; only the pattern itself and the
* match mode flags are copied.
* <p>
* Cloning can be particularly useful to threaded applications that perform
* multiple match operations in parallel. Each concurrent RE
* operation requires its own instance of a URegularExpression.
*
* @param regexp The compiled regular expression to be cloned.
* @param status Receives indication of any errors encountered
* @return the cloned copy of the compiled regular expression.
* @stable ICU 3.0
*/
U_STABLE URegularExpression * U_EXPORT2
uregex_clone(const URegularExpression *regexp, UErrorCode *status);
/**
* Returns a pointer to the source form of the pattern for this regular
expression.
* This function will work even if the pattern was originally specified as
a UText.
*
* @param regexp The compiled regular expression.
* @param patLength This output parameter will be set to the length of the
* pattern string. A NULL pointer may be used here if
the
* pattern length is not needed, as would be the case if
* the pattern is known in advance to be a NUL terminated
* string.
* @param status Receives errors detected by this function.
* @return a pointer to the pattern string. The storage for the string is
* owned by the regular expression object, and must not
be
* altered or deleted by the application. The returned
string
* will remain valid until the regular expression is
closed.
* @stable ICU 3.0
*/
U_STABLE const UChar * U_EXPORT2
uregex_pattern(const URegularExpression *regexp,
int32_t *patLength,
UErrorCode *status);
/**
* Returns the source text of the pattern for this regular expression.
* This function will work even if the pattern was originally specified as
a UChar string.
*
* @param regexp The compiled regular expression.
* @param status Receives errors detected by this function.
* @return the pattern text. The storage for the text is owned by the
regular expression
* object, and must not be altered or deleted.
*
* @stable ICU 4.6
*/
U_STABLE UText * U_EXPORT2
uregex_patternUText(const URegularExpression *regexp,
UErrorCode *status);
/**
* Get the match mode flags that were specified when compiling this
regular expression.
* @param status Receives errors detected by this function.
* @param regexp The compiled regular expression.
* @return The match mode flags
* @see URegexpFlag
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_flags(const URegularExpression *regexp,
UErrorCode *status);
/**
* Set the subject text string upon which the regular expression will
look for matches.
* This function may be called any number of times, allowing the regular
* expression pattern to be applied to different strings.
* <p>
* Regular expression matching operations work directly on the
application's
* string data. No copy is made. The subject string data must not be
* altered after calling this function until after all regular expression
* operations involving this string data are completed.
* <p>
* Zero length strings are permitted. In this case, no subsequent match
* operation will dereference the text string pointer.
*
* @param regexp The compiled regular expression.
* @param text The subject text string.
* @param textLength The length of the subject text, or -1 if the string
* is NUL terminated.
* @param status Receives errors detected by this function.
* @stable ICU 3.0
*/
U_STABLE void U_EXPORT2
uregex_setText(URegularExpression *regexp,
const UChar *text,
int32_t textLength,
UErrorCode *status);
/**
* Set the subject text string upon which the regular expression will
look for matches.
* This function may be called any number of times, allowing the regular
* expression pattern to be applied to different strings.
* <p>
* Regular expression matching operations work directly on the
application's
* string data; only a shallow clone is made. The subject string data
must not be
* altered after calling this function until after all regular expression
* operations involving this string data are completed.
*
* @param regexp The compiled regular expression.
* @param text The subject text string.
* @param status Receives errors detected by this function.
*
* @stable ICU 4.6
*/
U_STABLE void U_EXPORT2
uregex_setUText(URegularExpression *regexp,
UText *text,
UErrorCode *status);
/**
* Get the subject text that is currently associated with this
* regular expression object. If the input was supplied using
uregex_setText(),
* that pointer will be returned. Otherwise, the characters in the
input will
* be extracted to a buffer and returned. In either case, ownership
remains
* with the regular expression object.
*
* This function will work even if the input was originally specified as
a UText.
*
* @param regexp The compiled regular expression.
* @param textLength The length of the string is returned in this output
parameter.
* A NULL pointer may be used here if the
* text length is not needed, as would be the case if
* the text is known in advance to be a NUL terminated
* string.
* @param status Receives errors detected by this function.
* @return Pointer to the subject text string currently
associated with
* this regular expression.
* @stable ICU 3.0
*/
U_STABLE const UChar * U_EXPORT2
uregex_getText(URegularExpression *regexp,
int32_t *textLength,
UErrorCode *status);
/**
* Get the subject text that is currently associated with this
* regular expression object.
*
* This function will work even if the input was originally specified as
a UChar string.
*
* @param regexp The compiled regular expression.
* @param dest A mutable UText in which to store the current input.
* If NULL, a new UText will be created as an immutable
shallow clone
* of the actual input string.
* @param status Receives errors detected by this function.
* @return The subject text currently associated with this
regular expression.
* If a pre-allocated UText was provided, it will
always be used and returned.
*
* @stable ICU 4.6
*/
U_STABLE UText * U_EXPORT2
uregex_getUText(URegularExpression *regexp,
UText *dest,
UErrorCode *status);
/**
* Set the subject text string upon which the regular expression is
looking for matches
* without changing any other aspect of the matching state.
* The new and previous text strings must have the same content.
*
* This function is intended for use in environments where ICU is
operating on
* strings that may move around in memory. It provides a mechanism for
notifying
* ICU that the string has been relocated, and providing a new UText to
access the
* string in its new position.
*
* Note that the regular expression implementation never copies the
underlying text
* of a string being matched, but always operates directly on the
original text
* provided by the user. Refreshing simply drops the references to the
old text
* and replaces them with references to the new.
*
* Caution: this function is normally used only by very specialized
* system-level code. One example use case is with garbage
collection
* that moves the text in memory.
*
* @param regexp The compiled regular expression.
* @param text The new (moved) text string.
* @param status Receives errors detected by this function.
*
* @stable ICU 4.8
*/
U_STABLE void U_EXPORT2
uregex_refreshUText(URegularExpression *regexp,
UText *text,
UErrorCode *status);
/**
* Attempts to match the input string against the pattern.
* To succeed, the match must extend to the end of the string,
* or cover the complete match region.
*
* If startIndex >= zero the match operation starts at the specified
* index and must extend to the end of the input string. Any region
* that has been specified is reset.
*
* If startIndex == -1 the match must cover the input region, or the
entire
* input string if no region has been set. This directly corresponds to
* Matcher.matches() in Java
*
* @param regexp The compiled regular expression.
* @param startIndex The input string (native) index at which to
begin matching, or -1
* to match the input Region.
* @param status Receives errors detected by this function.
* @return TRUE if there is a match
* @stable ICU 3.0
*/
U_STABLE UBool U_EXPORT2
uregex_matches(URegularExpression *regexp,
int32_t startIndex,
UErrorCode *status);
/**
* 64bit version of uregex_matches.
* Attempts to match the input string against the pattern.
* To succeed, the match must extend to the end of the string,
* or cover the complete match region.
*
* If startIndex >= zero the match operation starts at the specified
* index and must extend to the end of the input string. Any region
* that has been specified is reset.
*
* If startIndex == -1 the match must cover the input region, or the
entire
* input string if no region has been set. This directly corresponds to
* Matcher.matches() in Java
*
* @param regexp The compiled regular expression.
* @param startIndex The input string (native) index at which to
begin matching, or -1
* to match the input Region.
* @param status Receives errors detected by this function.
* @return TRUE if there is a match
* @stable ICU 4.6
*/
U_STABLE UBool U_EXPORT2
uregex_matches64(URegularExpression *regexp,
int64_t startIndex,
UErrorCode *status);
/**
* Attempts to match the input string, starting from the specified
index, against the pattern.
* The match may be of any length, and is not required to extend to the
end
* of the input string. Contrast with uregex_matches().
*
* <p>If startIndex is >= 0 any input region that was set for
this
* URegularExpression is reset before the operation begins.
*
* <p>If the specified starting index == -1 the match begins at
the start of the input
* region, or at the start of the full string if no region has been
specified.
* This corresponds directly with Matcher.lookingAt() in Java.
*
* <p>If the match succeeds then more information can be obtained
via the
* <code>uregexp_start()</code>,
<code>uregexp_end()</code>,
* and <code>uregexp_group()</code> functions.</p>
*
* @param regexp The compiled regular expression.
* @param startIndex The input string (native) index at which to
begin matching, or
* -1 to match the Input Region
* @param status A reference to a UErrorCode to receive any
errors.
* @return TRUE if there is a match.
* @stable ICU 3.0
*/
U_STABLE UBool U_EXPORT2
uregex_lookingAt(URegularExpression *regexp,
int32_t startIndex,
UErrorCode *status);
/**
* 64bit version of uregex_lookingAt.
* Attempts to match the input string, starting from the specified
index, against the pattern.
* The match may be of any length, and is not required to extend to the
end
* of the input string. Contrast with uregex_matches().
*
* <p>If startIndex is >= 0 any input region that was set for
this
* URegularExpression is reset before the operation begins.
*
* <p>If the specified starting index == -1 the match begins at
the start of the input
* region, or at the start of the full string if no region has been
specified.
* This corresponds directly with Matcher.lookingAt() in Java.
*
* <p>If the match succeeds then more information can be obtained
via the
* <code>uregexp_start()</code>,
<code>uregexp_end()</code>,
* and <code>uregexp_group()</code> functions.</p>
*
* @param regexp The compiled regular expression.
* @param startIndex The input string (native) index at which to
begin matching, or
* -1 to match the Input Region
* @param status A reference to a UErrorCode to receive any
errors.
* @return TRUE if there is a match.
* @stable ICU 4.6
*/
U_STABLE UBool U_EXPORT2
uregex_lookingAt64(URegularExpression *regexp,
int64_t startIndex,
UErrorCode *status);
/**
* Find the first matching substring of the input string that matches
the pattern.
* If startIndex is >= zero the search for a match begins at the
specified index,
* and any match region is reset. This corresponds directly with
* Matcher.find(startIndex) in Java.
*
* If startIndex == -1 the search begins at the start of the input
region,
* or at the start of the full string if no region has been
specified.
*
* If a match is found, <code>uregex_start(),
uregex_end()</code>, and
* <code>uregex_group()</code> will provide more information
regarding the match.
*
* @param regexp The compiled regular expression.
* @param startIndex The position (native) in the input string to
begin the search, or
* -1 to search within the Input Region.
* @param status A reference to a UErrorCode to receive any
errors.
* @return TRUE if a match is found.
* @stable ICU 3.0
*/
U_STABLE UBool U_EXPORT2
uregex_find(URegularExpression *regexp,
int32_t startIndex,
UErrorCode *status);
/**
* 64bit version of uregex_find.
* Find the first matching substring of the input string that matches
the pattern.
* If startIndex is >= zero the search for a match begins at the
specified index,
* and any match region is reset. This corresponds directly with
* Matcher.find(startIndex) in Java.
*
* If startIndex == -1 the search begins at the start of the input
region,
* or at the start of the full string if no region has been
specified.
*
* If a match is found, <code>uregex_start(),
uregex_end()</code>, and
* <code>uregex_group()</code> will provide more information
regarding the match.
*
* @param regexp The compiled regular expression.
* @param startIndex The position (native) in the input string to
begin the search, or
* -1 to search within the Input Region.
* @param status A reference to a UErrorCode to receive any
errors.
* @return TRUE if a match is found.
* @stable ICU 4.6
*/
U_STABLE UBool U_EXPORT2
uregex_find64(URegularExpression *regexp,
int64_t startIndex,
UErrorCode *status);
/**
* Find the next pattern match in the input string. Begin searching
* the input at the location following the end of he previous match,
* or at the start of the string (or region) if there is no
* previous match. If a match is found, <code>uregex_start(),
uregex_end()</code>, and
* <code>uregex_group()</code> will provide more information
regarding the match.
*
* @param regexp The compiled regular expression.
* @param status A reference to a UErrorCode to receive any
errors.
* @return TRUE if a match is found.
* @see uregex_reset
* @stable ICU 3.0
*/
U_STABLE UBool U_EXPORT2
uregex_findNext(URegularExpression *regexp,
UErrorCode *status);
/**
* Get the number of capturing groups in this regular expression's
pattern.
* @param regexp The compiled regular expression.
* @param status A reference to a UErrorCode to receive any
errors.
* @return the number of capture groups
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_groupCount(URegularExpression *regexp,
UErrorCode *status);
/** Extract the string for the specified matching expression or
subexpression.
* Group #0 is the complete string of matched text.
* Group #1 is the text matched by the first set of capturing parentheses.
*
* @param regexp The compiled regular expression.
* @param groupNum The capture group to extract. Group 0 is the
complete
* match. The value of this parameter must be
* less than or equal to the number of capture
groups in
* the pattern.
* @param dest Buffer to receive the matching string data
* @param destCapacity Capacity of the dest buffer.
* @param status A reference to a UErrorCode to receive any
errors.
* @return Length of matching data,
* or -1 if no applicable match.
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_group(URegularExpression *regexp,
int32_t groupNum,
UChar *dest,
int32_t destCapacity,
UErrorCode *status);
/** Returns a shallow immutable clone of the entire input string. The
returned UText current native index
* is set to the beginning of the requested capture group. The capture
group length is also
* returned via groupLength.
* Group #0 is the complete string of matched text.
* Group #1 is the text matched by the first set of capturing parentheses.
*
* @param regexp The compiled regular expression.
* @param groupNum The capture group to extract. Group 0 is the
complete
* match. The value of this parameter must be
* less than or equal to the number of capture
groups in
* the pattern.
* @param dest A mutable UText in which to store the current
input.
* If NULL, a new UText will be created as an
immutable shallow clone
* of the entire input string.
* @param groupLength The group length of the desired capture group.
* @param status A reference to a UErrorCode to receive any
errors.
* @return The subject text currently associated with this
regular expression.
* If a pre-allocated UText was provided, it will
always be used and returned.
*
* @stable ICU 4.6
*/
U_STABLE UText * U_EXPORT2
uregex_groupUText(URegularExpression *regexp,
int32_t groupNum,
UText *dest,
int64_t *groupLength,
UErrorCode *status);
#ifndef U_HIDE_INTERNAL_API
/** Extract the string for the specified matching expression or
subexpression.
* Group #0 is the complete string of matched text.
* Group #1 is the text matched by the first set of capturing parentheses.
*
* @param regexp The compiled regular expression.
* @param groupNum The capture group to extract. Group 0 is the
complete
* match. The value of this parameter must be
* less than or equal to the number of capture
groups in
* the pattern.
* @param dest Mutable UText to receive the matching string
data.
* If NULL, a new UText will be created (which may
not be mutable).
* @param status A reference to a UErrorCode to receive any
errors.
* @return The matching string data. If a pre-allocated
UText was provided,
* it will always be used and returned.
*
* @internal ICU 4.4 technology preview
*/
U_INTERNAL UText * U_EXPORT2
uregex_groupUTextDeep(URegularExpression *regexp,
int32_t groupNum,
UText *dest,
UErrorCode *status);
#endif /* U_HIDE_INTERNAL_API */
/**
* Returns the index in the input string of the start of the text
matched by the
* specified capture group during the previous match operation. Return
-1 if
* the capture group was not part of the last match.
* Group #0 refers to the complete range of matched text.
* Group #1 refers to the text matched by the first set of capturing
parentheses.
*
* @param regexp The compiled regular expression.
* @param groupNum The capture group number
* @param status A reference to a UErrorCode to receive any
errors.
* @return the starting (native) position in the input of
the text matched
* by the specified group.
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_start(URegularExpression *regexp,
int32_t groupNum,
UErrorCode *status);
/**
* 64bit version of uregex_start.
* Returns the index in the input string of the start of the text
matched by the
* specified capture group during the previous match operation. Return
-1 if
* the capture group was not part of the last match.
* Group #0 refers to the complete range of matched text.
* Group #1 refers to the text matched by the first set of capturing
parentheses.
*
* @param regexp The compiled regular expression.
* @param groupNum The capture group number
* @param status A reference to a UErrorCode to receive any
errors.
* @return the starting (native) position in the input of
the text matched
* by the specified group.
* @stable ICU 4.6
*/
U_STABLE int64_t U_EXPORT2
uregex_start64(URegularExpression *regexp,
int32_t groupNum,
UErrorCode *status);
/**
* Returns the index in the input string of the position following the
end
* of the text matched by the specified capture group.
* Return -1 if the capture group was not part of the last match.
* Group #0 refers to the complete range of matched text.
* Group #1 refers to the text matched by the first set of capturing
parentheses.
*
* @param regexp The compiled regular expression.
* @param groupNum The capture group number
* @param status A reference to a UErrorCode to receive any
errors.
* @return the (native) index of the position following
the last matched character.
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_end(URegularExpression *regexp,
int32_t groupNum,
UErrorCode *status);
/**
* 64bit version of uregex_end.
* Returns the index in the input string of the position following the
end
* of the text matched by the specified capture group.
* Return -1 if the capture group was not part of the last match.
* Group #0 refers to the complete range of matched text.
* Group #1 refers to the text matched by the first set of capturing
parentheses.
*
* @param regexp The compiled regular expression.
* @param groupNum The capture group number
* @param status A reference to a UErrorCode to receive any
errors.
* @return the (native) index of the position following
the last matched character.
* @stable ICU 4.6
*/
U_STABLE int64_t U_EXPORT2
uregex_end64(URegularExpression *regexp,
int32_t groupNum,
UErrorCode *status);
/**
* Reset any saved state from the previous match. Has the effect of
* causing uregex_findNext to begin at the specified index, and causing
* uregex_start(), uregex_end() and uregex_group() to return an error
* indicating that there is no match information available. Clears any
* match region that may have been set.
*
* @param regexp The compiled regular expression.
* @param index The position (native) in the text at which a
* uregex_findNext() should begin searching.
* @param status A reference to a UErrorCode to receive any
errors.
* @stable ICU 3.0
*/
U_STABLE void U_EXPORT2
uregex_reset(URegularExpression *regexp,
int32_t index,
UErrorCode *status);
/**
* 64bit version of uregex_reset.
* Reset any saved state from the previous match. Has the effect of
* causing uregex_findNext to begin at the specified index, and causing
* uregex_start(), uregex_end() and uregex_group() to return an error
* indicating that there is no match information available. Clears any
* match region that may have been set.
*
* @param regexp The compiled regular expression.
* @param index The position (native) in the text at which a
* uregex_findNext() should begin searching.
* @param status A reference to a UErrorCode to receive any
errors.
* @stable ICU 4.6
*/
U_STABLE void U_EXPORT2
uregex_reset64(URegularExpression *regexp,
int64_t index,
UErrorCode *status);
/**
* Sets the limits of the matching region for this URegularExpression.
* The region is the part of the input string that will be considered when
matching.
* Invoking this method resets any saved state from the previous match,
* then sets the region to start at the index specified by the start
parameter
* and end at the index specified by the end parameter.
*
* Depending on the transparency and anchoring being used (see
useTransparentBounds
* and useAnchoringBounds), certain constructs such as anchors may behave
differently
* at or around the boundaries of the region
*
* The function will fail if start is greater than limit, or if either
index
* is less than zero or greater than the length of the string being
matched.
*
* @param regexp The compiled regular expression.
* @param regionStart The (native) index to begin searches at.
* @param regionLimit The (native) index to end searches at (exclusive).
* @param status A pointer to a UErrorCode to receive any errors.
* @stable ICU 4.0
*/
U_STABLE void U_EXPORT2
uregex_setRegion(URegularExpression *regexp,
int32_t regionStart,
int32_t regionLimit,
UErrorCode *status);
/**
* 64bit version of uregex_setRegion.
* Sets the limits of the matching region for this URegularExpression.
* The region is the part of the input string that will be considered when
matching.
* Invoking this method resets any saved state from the previous match,
* then sets the region to start at the index specified by the start
parameter
* and end at the index specified by the end parameter.
*
* Depending on the transparency and anchoring being used (see
useTransparentBounds
* and useAnchoringBounds), certain constructs such as anchors may behave
differently
* at or around the boundaries of the region
*
* The function will fail if start is greater than limit, or if either
index
* is less than zero or greater than the length of the string being
matched.
*
* @param regexp The compiled regular expression.
* @param regionStart The (native) index to begin searches at.
* @param regionLimit The (native) index to end searches at (exclusive).
* @param status A pointer to a UErrorCode to receive any errors.
* @stable ICU 4.6
*/
U_STABLE void U_EXPORT2
uregex_setRegion64(URegularExpression *regexp,
int64_t regionStart,
int64_t regionLimit,
UErrorCode *status);
/**
* Set the matching region and the starting index for subsequent matches
* in a single operation.
* This is useful because the usual function for setting the starting
* index, urgex_reset(), also resets any region limits.
*
* @param regexp The compiled regular expression.
* @param regionStart The (native) index to begin searches at.
* @param regionLimit The (native) index to end searches at (exclusive).
* @param startIndex The index in the input text at which the next
* match operation should begin.
* @param status A pointer to a UErrorCode to receive any errors.
* @stable ICU 4.6
*/
U_STABLE void U_EXPORT2
uregex_setRegionAndStart(URegularExpression *regexp,
int64_t regionStart,
int64_t regionLimit,
int64_t startIndex,
UErrorCode *status);
/**
* Reports the start index of the matching region. Any matches found are
limited to
* to the region bounded by regionStart (inclusive) and regionEnd
(exclusive).
*
* @param regexp The compiled regular expression.
* @param status A pointer to a UErrorCode to receive any errors.
* @return The starting (native) index of this matcher's region.
* @stable ICU 4.0
*/
U_STABLE int32_t U_EXPORT2
uregex_regionStart(const URegularExpression *regexp,
UErrorCode *status);
/**
* 64bit version of uregex_regionStart.
* Reports the start index of the matching region. Any matches found are
limited to
* to the region bounded by regionStart (inclusive) and regionEnd
(exclusive).
*
* @param regexp The compiled regular expression.
* @param status A pointer to a UErrorCode to receive any errors.
* @return The starting (native) index of this matcher's region.
* @stable ICU 4.6
*/
U_STABLE int64_t U_EXPORT2
uregex_regionStart64(const URegularExpression *regexp,
UErrorCode *status);
/**
* Reports the end index (exclusive) of the matching region for this
URegularExpression.
* Any matches found are limited to to the region bounded by regionStart
(inclusive)
* and regionEnd (exclusive).
*
* @param regexp The compiled regular expression.
* @param status A pointer to a UErrorCode to receive any errors.
* @return The ending point (native) of this matcher's region.
* @stable ICU 4.0
*/
U_STABLE int32_t U_EXPORT2
uregex_regionEnd(const URegularExpression *regexp,
UErrorCode *status);
/**
* 64bit version of uregex_regionEnd.
* Reports the end index (exclusive) of the matching region for this
URegularExpression.
* Any matches found are limited to to the region bounded by regionStart
(inclusive)
* and regionEnd (exclusive).
*
* @param regexp The compiled regular expression.
* @param status A pointer to a UErrorCode to receive any errors.
* @return The ending point (native) of this matcher's region.
* @stable ICU 4.6
*/
U_STABLE int64_t U_EXPORT2
uregex_regionEnd64(const URegularExpression *regexp,
UErrorCode *status);
/**
* Queries the transparency of region bounds for this URegularExpression.
* See useTransparentBounds for a description of transparent and opaque
bounds.
* By default, matching boundaries are opaque.
*
* @param regexp The compiled regular expression.
* @param status A pointer to a UErrorCode to receive any errors.
* @return TRUE if this matcher is using opaque bounds, false if it is
not.
* @stable ICU 4.0
*/
U_STABLE UBool U_EXPORT2
uregex_hasTransparentBounds(const URegularExpression *regexp,
UErrorCode *status);
/**
* Sets the transparency of region bounds for this URegularExpression.
* Invoking this function with an argument of TRUE will set matches to use
transparent bounds.
* If the boolean argument is FALSE, then opaque bounds will be used.
*
* Using transparent bounds, the boundaries of the matching region are
transparent
* to lookahead, lookbehind, and boundary matching constructs. Those
constructs can
* see text beyond the boundaries of the region while checking for a
match.
*
* With opaque bounds, no text outside of the matching region is visible
to lookahead,
* lookbehind, and boundary matching constructs.
*
* By default, opaque bounds are used.
*
* @param regexp The compiled regular expression.
* @param b TRUE for transparent bounds; FALSE for opaque bounds
* @param status A pointer to a UErrorCode to receive any errors.
* @stable ICU 4.0
**/
U_STABLE void U_EXPORT2
uregex_useTransparentBounds(URegularExpression *regexp,
UBool b,
UErrorCode *status);
/**
* Return true if this URegularExpression is using anchoring bounds.
* By default, anchoring region bounds are used.
*
* @param regexp The compiled regular expression.
* @param status A pointer to a UErrorCode to receive any errors.
* @return TRUE if this matcher is using anchoring bounds.
* @stable ICU 4.0
*/
U_STABLE UBool U_EXPORT2
uregex_hasAnchoringBounds(const URegularExpression *regexp,
UErrorCode *status);
/**
* Set whether this URegularExpression is using Anchoring Bounds for its
region.
* With anchoring bounds, pattern anchors such as ^ and $ will match at
the start
* and end of the region. Without Anchoring Bounds, anchors will only
match at
* the positions they would in the complete text.
*
* Anchoring Bounds are the default for regions.
*
* @param regexp The compiled regular expression.
* @param b TRUE if to enable anchoring bounds; FALSE to disable
them.
* @param status A pointer to a UErrorCode to receive any errors.
* @stable ICU 4.0
*/
U_STABLE void U_EXPORT2
uregex_useAnchoringBounds(URegularExpression *regexp,
UBool b,
UErrorCode *status);
/**
* Return TRUE if the most recent matching operation touched the
* end of the text being processed. In this case, additional input text
could
* change the results of that match.
*
* @param regexp The compiled regular expression.
* @param status A pointer to a UErrorCode to receive any errors.
* @return TRUE if the most recent match hit the end of input
* @stable ICU 4.0
*/
U_STABLE UBool U_EXPORT2
uregex_hitEnd(const URegularExpression *regexp,
UErrorCode *status);
/**
* Return TRUE the most recent match succeeded and additional input could
cause
* it to fail. If this function returns false and a match was found, then
more input
* might change the match but the match won't be lost. If a match was
not found,
* then requireEnd has no meaning.
*
* @param regexp The compiled regular expression.
* @param status A pointer to a UErrorCode to receive any errors.
* @return TRUE if more input could cause the most recent match to no
longer match.
* @stable ICU 4.0
*/
U_STABLE UBool U_EXPORT2
uregex_requireEnd(const URegularExpression *regexp,
UErrorCode *status);
/**
* Replaces every substring of the input that matches the pattern
* with the given replacement string. This is a convenience function
that
* provides a complete find-and-replace-all operation.
*
* This method scans the input string looking for matches of the
pattern.
* Input that is not part of any match is copied unchanged to the
* destination buffer. Matched regions are replaced in the output
* buffer by the replacement string. The replacement string may
contain
* references to capture groups; these take the form of $1, $2, etc.
*
* @param regexp The compiled regular expression.
* @param replacementText A string containing the replacement
text.
* @param replacementLength The length of the replacement string, or
* -1 if it is NUL terminated.
* @param destBuf A (UChar *) buffer that will receive the
result.
* @param destCapacity The capacity of the destination buffer.
* @param status A reference to a UErrorCode to receive
any errors.
* @return The length of the string resulting from
the find
* and replace operation. In the event
that the
* destination capacity is inadequate, the
return value
* is still the full length of the
untruncated string.
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_replaceAll(URegularExpression *regexp,
const UChar *replacementText,
int32_t replacementLength,
UChar *destBuf,
int32_t destCapacity,
UErrorCode *status);
/**
* Replaces every substring of the input that matches the pattern
* with the given replacement string. This is a convenience function
that
* provides a complete find-and-replace-all operation.
*
* This method scans the input string looking for matches of the
pattern.
* Input that is not part of any match is copied unchanged to the
* destination buffer. Matched regions are replaced in the output
* buffer by the replacement string. The replacement string may
contain
* references to capture groups; these take the form of $1, $2, etc.
*
* @param regexp The compiled regular expression.
* @param replacement A string containing the replacement text.
* @param dest A mutable UText that will receive the
result.
* If NULL, a new UText will be created (which
may not be mutable).
* @param status A reference to a UErrorCode to receive any
errors.
* @return A UText containing the results of the find
and replace.
* If a pre-allocated UText was provided, it
will always be used and returned.
*
* @stable ICU 4.6
*/
U_STABLE UText * U_EXPORT2
uregex_replaceAllUText(URegularExpression *regexp,
UText *replacement,
UText *dest,
UErrorCode *status);
/**
* Replaces the first substring of the input that matches the pattern
* with the given replacement string. This is a convenience function
that
* provides a complete find-and-replace operation.
*
* This method scans the input string looking for a match of the
pattern.
* All input that is not part of the match is copied unchanged to the
* destination buffer. The matched region is replaced in the output
* buffer by the replacement string. The replacement string may
contain
* references to capture groups; these take the form of $1, $2, etc.
*
* @param regexp The compiled regular expression.
* @param replacementText A string containing the replacement
text.
* @param replacementLength The length of the replacement string, or
* -1 if it is NUL terminated.
* @param destBuf A (UChar *) buffer that will receive the
result.
* @param destCapacity The capacity of the destination buffer.
* @param status a reference to a UErrorCode to receive
any errors.
* @return The length of the string resulting from
the find
* and replace operation. In the event
that the
* destination capacity is inadequate, the
return value
* is still the full length of the
untruncated string.
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_replaceFirst(URegularExpression *regexp,
const UChar *replacementText,
int32_t replacementLength,
UChar *destBuf,
int32_t destCapacity,
UErrorCode *status);
/**
* Replaces the first substring of the input that matches the pattern
* with the given replacement string. This is a convenience function
that
* provides a complete find-and-replace operation.
*
* This method scans the input string looking for a match of the
pattern.
* All input that is not part of the match is copied unchanged to the
* destination buffer. The matched region is replaced in the output
* buffer by the replacement string. The replacement string may
contain
* references to capture groups; these take the form of $1, $2, etc.
*
* @param regexp The compiled regular expression.
* @param replacement A string containing the replacement text.
* @param dest A mutable UText that will receive the
result.
* If NULL, a new UText will be created (which
may not be mutable).
* @param status A reference to a UErrorCode to receive any
errors.
* @return A UText containing the results of the find
and replace.
* If a pre-allocated UText was provided, it
will always be used and returned.
*
* @stable ICU 4.6
*/
U_STABLE UText * U_EXPORT2
uregex_replaceFirstUText(URegularExpression *regexp,
UText *replacement,
UText *dest,
UErrorCode *status);
/**
* Implements a replace operation intended to be used as part of an
* incremental find-and-replace.
*
* <p>The input string, starting from the end of the previous
match and ending at
* the start of the current match, is appended to the destination
string. Then the
* replacement string is appended to the output string,
* including handling any substitutions of captured text.</p>
*
* <p>A note on preflight computation of buffersize and error
handling:
* Calls to uregex_appendReplacement() and uregex_appendTail() are
* designed to be chained, one after another, with the destination
* buffer pointer and buffer capacity updated after each in preparation
* to for the next. If the destination buffer is exhausted partway
through such a
* sequence, a U_BUFFER_OVERFLOW_ERROR status will be returned. Normal
* ICU conventions are for a function to perform no action if it is
* called with an error status, but for this one case,
uregex_appendRepacement()
* will operate normally so that buffer size computations will complete
* correctly.
*
* <p>For simple, prepackaged, non-incremental find-and-replace
* operations, see replaceFirst() or replaceAll().</p>
*
* @param regexp The regular expression object.
* @param replacementText The string that will replace the matched
portion of the
* input string as it is copied to the destination
buffer.
* The replacement text may contain references ($1,
for
* example) to capture groups from the match.
* @param replacementLength The length of the replacement text
string,
* or -1 if the string is NUL terminated.
* @param destBuf The buffer into which the results of the
* find-and-replace are placed. On return, this
pointer
* will be updated to refer to the beginning of the
* unused portion of buffer, leaving it in position
for
* a subsequent call to this function.
* @param destCapacity The size of the output buffer, On return, this
* parameter will be updated to reflect the space
remaining
* unused in the output buffer.
* @param status A reference to a UErrorCode to receive any
errors.
* @return The length of the result string. In the event
that
* destCapacity is inadequate, the full length of
the
* untruncated output string is returned.
*
* @stable ICU 3.0
*
*/
U_STABLE int32_t U_EXPORT2
uregex_appendReplacement(URegularExpression *regexp,
const UChar *replacementText,
int32_t replacementLength,
UChar **destBuf,
int32_t *destCapacity,
UErrorCode *status);
/**
* Implements a replace operation intended to be used as part of an
* incremental find-and-replace.
*
* <p>The input string, starting from the end of the previous
match and ending at
* the start of the current match, is appended to the destination
string. Then the
* replacement string is appended to the output string,
* including handling any substitutions of captured text.</p>
*
* <p>For simple, prepackaged, non-incremental find-and-replace
* operations, see replaceFirst() or replaceAll().</p>
*
* @param regexp The regular expression object.
* @param replacementText The string that will replace the matched
portion of the
* input string as it is copied to the destination
buffer.
* The replacement text may contain references ($1,
for
* example) to capture groups from the match.
* @param dest A mutable UText that will receive the result.
Must not be NULL.
* @param status A reference to a UErrorCode to receive any
errors.
*
* @stable ICU 4.6
*/
U_STABLE void U_EXPORT2
uregex_appendReplacementUText(URegularExpression *regexp,
UText *replacementText,
UText *dest,
UErrorCode *status);
/**
* As the final step in a find-and-replace operation, append the remainder
* of the input string, starting at the position following the last match,
* to the destination string. <code>uregex_appendTail()</code>
is intended
* to be invoked after one or more invocations of the
* <code>uregex_appendReplacement()</code> function.
*
* @param regexp The regular expression object. This is needed
to
* obtain the input string and with the position
* of the last match within it.
* @param destBuf The buffer in which the results of the
* find-and-replace are placed. On return, the
pointer
* will be updated to refer to the beginning of the
* unused portion of buffer.
* @param destCapacity The size of the output buffer, On return, this
* value will be updated to reflect the space
remaining
* unused in the output buffer.
* @param status A reference to a UErrorCode to receive any
errors.
* @return The length of the result string. In the event
that
* destCapacity is inadequate, the full length of
the
* untruncated output string is returned.
*
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_appendTail(URegularExpression *regexp,
UChar **destBuf,
int32_t *destCapacity,
UErrorCode *status);
/**
* As the final step in a find-and-replace operation, append the remainder
* of the input string, starting at the position following the last match,
* to the destination string.
<code>uregex_appendTailUText()</code> is intended
* to be invoked after one or more invocations of the
* <code>uregex_appendReplacementUText()</code> function.
*
* @param regexp The regular expression object. This is needed
to
* obtain the input string and with the position
* of the last match within it.
* @param dest A mutable UText that will receive the result.
Must not be NULL.
*
* @param status Error code
*
* @return The destination UText.
*
* @stable ICU 4.6
*/
U_STABLE UText * U_EXPORT2
uregex_appendTailUText(URegularExpression *regexp,
UText *dest,
UErrorCode *status);
/**
* Split a string into fields. Somewhat like split() from Perl.
* The pattern matches identify delimiters that separate the input
* into fields. The input data between the matches becomes the
* fields themselves.
*
* Each of the fields is copied from the input string to the destination
* buffer, and NUL terminated. The position of each field within
* the destination buffer is returned in the destFields array.
*
* If the delimiter pattern includes capture groups, the captured text
will
* also appear in the destination array of output strings, interspersed
* with the fields. This is similar to Perl, but differs from Java,
* which ignores the presence of capture groups in the pattern.
*
* Trailing empty fields will always be returned, assuming sufficient
* destination capacity. This differs from the default behavior for
Java
* and Perl where trailing empty fields are not returned.
*
* The number of strings produced by the split operation is returned.
* This count includes the strings from capture groups in the delimiter
pattern.
* This behavior differs from Java, which ignores capture groups.
*
* @param regexp The compiled regular expression.
* @param destBuf A (UChar *) buffer to receive the fields that
* are extracted from the input string. These
* field pointers will refer to positions within
the
* destination buffer supplied by the caller.
Any
* extra positions within the destFields array
will be
* set to NULL.
* @param destCapacity The capacity of the destBuf.
* @param requiredCapacity The actual capacity required of the
destBuf.
* If destCapacity is too small, requiredCapacity
will return
* the total capacity required to hold all of the
output, and
* a U_BUFFER_OVERFLOW_ERROR will be returned.
* @param destFields An array to be filled with the position of
each
* of the extracted fields within destBuf.
* @param destFieldsCapacity The number of elements in the
destFields array.
* If the number of fields found is less than
destFieldsCapacity,
* the extra destFields elements are set to zero.
* If destFieldsCapacity is too small, the trailing part
of the
* input, including any field delimiters, is treated as if
it
* were the last field - it is copied to the destBuf, and
* its position is in the destBuf is stored in the last
element
* of destFields. This behavior mimics that of Perl. It
is not
* an error condition, and no error status is returned
when all destField
* positions are used.
* @param status A reference to a UErrorCode to receive any errors.
* @return The number of fields into which the input string was
split.
* @stable ICU 3.0
*/
U_STABLE int32_t U_EXPORT2
uregex_split( URegularExpression *regexp,
UChar *destBuf,
int32_t destCapacity,
int32_t *requiredCapacity,
UChar *destFields[],
int32_t destFieldsCapacity,
UErrorCode *status);
/**
* Split a string into fields. Somewhat like split() from Perl.
* The pattern matches identify delimiters that separate the input
* into fields. The input data between the matches becomes the
* fields themselves.
* <p>
* The behavior of this function is not very closely aligned with
uregex_split();
* instead, it is based on (and implemented directly on top of) the C++
split method.
*
* @param regexp The compiled regular expression.
* @param destFields An array of mutable UText structs to receive the
results of the split.
* If a field is NULL, a new UText is allocated to contain
the results for
* that field. This new UText is not guaranteed to be
mutable.
* @param destFieldsCapacity The number of elements in the destination
array.
* If the number of fields found is less than
destCapacity, the
* extra strings in the destination array are not altered.
* If the number of destination strings is less than the
number
* of fields, the trailing part of the input string,
including any
* field delimiters, is placed in the last destination
string.
* This behavior mimics that of Perl. It is not an error
condition, and no
* error status is returned when all destField positions
are used.
* @param status A reference to a UErrorCode to receive any errors.
* @return The number of fields into which the input string was
split.
*
* @stable ICU 4.6
*/
U_STABLE int32_t U_EXPORT2
uregex_splitUText(URegularExpression *regexp,
UText *destFields[],
int32_t destFieldsCapacity,
UErrorCode *status);
/**
* Set a processing time limit for match operations with this
URegularExpression.
*
* Some patterns, when matching certain strings, can run in exponential
time.
* For practical purposes, the match operation may appear to be in an
* infinite loop.
* When a limit is set a match operation will fail with an error if the
* limit is exceeded.
* <p>
* The units of the limit are steps of the match engine.
* Correspondence with actual processor time will depend on the speed
* of the processor and the details of the specific pattern, but will
* typically be on the order of milliseconds.
* <p>
* By default, the matching time is not limited.
* <p>
*
* @param regexp The compiled regular expression.
* @param limit The limit value, or 0 for no limit.
* @param status A reference to a UErrorCode to receive any errors.
* @stable ICU 4.0
*/
U_STABLE void U_EXPORT2
uregex_setTimeLimit(URegularExpression *regexp,
int32_t limit,
UErrorCode *status);
/**
* Get the time limit for for matches with this URegularExpression.
* A return value of zero indicates that there is no limit.
*
* @param regexp The compiled regular expression.
* @param status A reference to a UErrorCode to receive any errors.
* @return the maximum allowed time for a match, in units of processing
steps.
* @stable ICU 4.0
*/
U_STABLE int32_t U_EXPORT2
uregex_getTimeLimit(const URegularExpression *regexp,
UErrorCode *status);
/**
* Set the amount of heap storage available for use by the match
backtracking stack.
* <p>
* ICU uses a backtracking regular expression engine, with the backtrack
stack
* maintained on the heap. This function sets the limit to the amount of
memory
* that can be used for this purpose. A backtracking stack overflow will
* result in an error from the match operation that caused it.
* <p>
* A limit is desirable because a malicious or poorly designed pattern can
use
* excessive memory, potentially crashing the process. A limit is enabled
* by default.
* <p>
* @param regexp The compiled regular expression.
* @param limit The maximum size, in bytes, of the matching
backtrack stack.
* A value of -1 means no limit.
* The limit must be greater than zero, or -1.
* @param status A reference to a UErrorCode to receive any errors.
*
* @stable ICU 4.0
*/
U_STABLE void U_EXPORT2
uregex_setStackLimit(URegularExpression *regexp,
int32_t limit,
UErrorCode *status);
/**
* Get the size of the heap storage available for use by the back tracking
stack.
*
* @return the maximum backtracking stack size, in bytes, or zero if the
* stack size is unlimited.
* @stable ICU 4.0
*/
U_STABLE int32_t U_EXPORT2
uregex_getStackLimit(const URegularExpression *regexp,
UErrorCode *status);
/**
* Function pointer for a regular expression matching callback function.
* When set, a callback function will be called periodically during
matching
* operations. If the call back function returns FALSE, the matching
* operation will be terminated early.
*
* Note: the callback function must not call other functions on this
* URegularExpression.
*
* @param context context pointer. The callback function will be invoked
* with the context specified at the time that
* uregex_setMatchCallback() is called.
* @param steps the accumulated processing time, in match steps,
* for this matching operation.
* @return TRUE to continue the matching operation.
* FALSE to terminate the matching operation.
* @stable ICU 4.0
*/
U_CDECL_BEGIN
typedef UBool U_CALLCONV URegexMatchCallback (
const void *context,
int32_t steps);
U_CDECL_END
/**
* Set a callback function for this URegularExpression.
* During matching operations the function will be called periodically,
* giving the application the opportunity to terminate a long-running
* match.
*
* @param regexp The compiled regular expression.
* @param callback A pointer to the user-supplied callback function.
* @param context User context pointer. The value supplied at the
* time the callback function is set will be saved
* and passed to the callback each time that it is
called.
* @param status A reference to a UErrorCode to receive any errors.
* @stable ICU 4.0
*/
U_STABLE void U_EXPORT2
uregex_setMatchCallback(URegularExpression *regexp,
URegexMatchCallback *callback,
const void *context,
UErrorCode *status);
/**
* Get the callback function for this URegularExpression.
*
* @param regexp The compiled regular expression.
* @param callback Out parameter, receives a pointer to the
user-supplied
* callback function.
* @param context Out parameter, receives the user context pointer
that
* was set when uregex_setMatchCallback() was called.
* @param status A reference to a UErrorCode to receive any errors.
* @stable ICU 4.0
*/
U_STABLE void U_EXPORT2
uregex_getMatchCallback(const URegularExpression *regexp,
URegexMatchCallback **callback,
const void **context,
UErrorCode *status);
/**
* Function pointer for a regular expression find callback function.
*
* When set, a callback function will be called during a find operation
* and for operations that depend on find, such as findNext, split and some
replace
* operations like replaceFirst.
* The callback will usually be called after each attempt at a match, but
this is not a
* guarantee that the callback will be invoked at each character. For
finds where the
* match engine is invoked at each character, this may be close to true,
but less likely
* for more optimized loops where the pattern is known to only start, and
the match
* engine invoked, at certain characters.
* When invoked, this callback will specify the index at which a match
operation is about
* to be attempted, giving the application the opportunity to terminate a
long-running
* find operation.
*
* If the call back function returns FALSE, the find operation will be
terminated early.
*
* Note: the callback function must not call other functions on this
* URegularExpression
*
* @param context context pointer. The callback function will be invoked
* with the context specified at the time that
* uregex_setFindProgressCallback() is called.
* @param matchIndex the next index at which a match attempt will be
attempted for this
* find operation. If this callback interrupts the search,
this is the
* index at which a find/findNext operation may be
re-initiated.
* @return TRUE to continue the matching operation.
* FALSE to terminate the matching operation.
* @stable ICU 4.6
*/
U_CDECL_BEGIN
typedef UBool U_CALLCONV URegexFindProgressCallback (
const void *context,
int64_t matchIndex);
U_CDECL_END
/**
* Set the find progress callback function for this URegularExpression.
*
* @param regexp The compiled regular expression.
* @param callback A pointer to the user-supplied callback function.
* @param context User context pointer. The value supplied at the
* time the callback function is set will be saved
* and passed to the callback each time that it is
called.
* @param status A reference to a UErrorCode to receive any errors.
* @stable ICU 4.6
*/
U_STABLE void U_EXPORT2
uregex_setFindProgressCallback(URegularExpression *regexp,
URegexFindProgressCallback *callback,
const void *context,
UErrorCode *status);
/**
* Get the find progress callback function for this URegularExpression.
*
* @param regexp The compiled regular expression.
* @param callback Out parameter, receives a pointer to the
user-supplied
* callback function.
* @param context Out parameter, receives the user context pointer
that
* was set when uregex_setFindProgressCallback() was
called.
* @param status A reference to a UErrorCode to receive any errors.
* @stable ICU 4.6
*/
U_STABLE void U_EXPORT2
uregex_getFindProgressCallback(const URegularExpression *regexp,
URegexFindProgressCallback
**callback,
const void
**context,
UErrorCode *status);
#endif /* !UCONFIG_NO_REGULAR_EXPRESSIONS */
#endif /* UREGEX_H */