Linux Manuals session 3

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int pcre_get_named_substring(const pcre *code, const char *subject, int *ovector, int stringcount, const char *stringname, const char **stringptr); int pcre16_get_named_substring(const pcre16 *code, PCRE_SPTR16 subject, int *ovector, int stringcount, PCRE_SPTR16 stringname, PCRE_SPTR16 *stringptr); int pcre32_get_named_substring(const pcre32 *code, PCRE_SPTR32 subject, int *ovector, int stringcount, PCRE_SPTR32 stringname, PCRE_SPTR32 *stringptr); Description This…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int pcre_fullinfo(const pcre *code, const pcre_extra *extra, int what, void *where); int pcre16_fullinfo(const pcre16 *code, const pcre16_extra *extra, int what, void *where); int pcre32_fullinfo(const pcre32 *code, const pcre32_extra *extra, int what, void *where); Description This function returns information about a compiled pattern. Its arguments are:   code                      Compiled regular…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> void pcre_free_substring_list(const char **stringptr); void pcre16_free_substring_list(PCRE_SPTR16 *stringptr); void pcre32_free_substring_list(PCRE_SPTR32 *stringptr); Description This is a convenience function for freeing the store obtained by a previous call to pcre[16|32]_get_substring_list(). Its only argument is a pointer to the list of string pointers. There is a complete description of the PCRE…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> void pcre_free_substring(const char *stringptr); void pcre16_free_substring(PCRE_SPTR16 stringptr); void pcre32_free_substring(PCRE_SPTR32 stringptr); Description This is a convenience function for freeing the store obtained by a previous call to pcre[16|32]_get_substring() or pcre[16|32]_get_named_substring(). Its only argument is a pointer to the string. There is a complete description of the PCRE native…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> void pcre_free_study(pcre_extra *extra); void pcre16_free_study(pcre16_extra *extra); void pcre32_free_study(pcre32_extra *extra); Description This function is used to free the memory used for the data generated by a call to pcre[16|32]_study() when it is no longer needed. The argument must be the result of such a call. There is a…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int pcre_exec(const pcre *code, const pcre_extra *extra, const char *subject, int length, int startoffset, int options, int *ovector, int ovecsize); int pcre16_exec(const pcre16 *code, const pcre16_extra *extra, PCRE_SPTR16 subject, int length, int startoffset, int options, int *ovector, int ovecsize); int pcre32_exec(const pcre32 *code, const pcre32_extra *extra, PCRE_SPTR32…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int pcre_dfa_exec(const pcre *code, const pcre_extra *extra, const char *subject, int length, int startoffset, int options, int *ovector, int ovecsize, int *workspace, int wscount); int pcre16_dfa_exec(const pcre16 *code, const pcre16_extra *extra, PCRE_SPTR16 subject, int length, int startoffset, int options, int *ovector, int ovecsize, int *workspace, int wscount);…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int pcre_copy_substring(const char *subject, int *ovector, int stringcount, int stringnumber, char *buffer, int buffersize); int pcre16_copy_substring(PCRE_SPTR16 subject, int *ovector, int stringcount, int stringnumber, PCRE_UCHAR16 *buffer, int buffersize); int pcre32_copy_substring(PCRE_SPTR32 subject, int *ovector, int stringcount, int stringnumber, PCRE_UCHAR32 *buffer, int buffersize); Description This is a convenience function for…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int pcre_copy_named_substring(const pcre *code, const char *subject, int *ovector, int stringcount, const char *stringname, char *buffer, int buffersize); int pcre16_copy_named_substring(const pcre16 *code, PCRE_SPTR16 subject, int *ovector, int stringcount, PCRE_SPTR16 stringname, PCRE_UCHAR16 *buffer, int buffersize); int pcre32_copy_named_substring(const pcre32 *code, PCRE_SPTR32 subject, int *ovector, int stringcount, PCRE_SPTR32 stringname, PCRE_UCHAR32…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int pcre_config(int what, void *where); int pcre16_config(int what, void *where); int pcre32_config(int what, void *where); Description This function makes it possible for a client program to find out which optional features are available in the version of the PCRE library it is using. The arguments are as…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> pcre *pcre_compile2(const char *pattern, int options, int *errorcodeptr, const char **errptr, int *erroffset, const unsigned char *tableptr); pcre16 *pcre16_compile2(PCRE_SPTR16 pattern, int options, int *errorcodeptr, const char **errptr, int *erroffset, const unsigned char *tableptr); pcre32 *pcre32_compile2(PCRE_SPTR32 pattern, int options, int *errorcodeptr,£ const char **errptr, int *erroffset, const unsigned…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> pcre *pcre_compile(const char *pattern, int options, const char **errptr, int *erroffset, const unsigned char *tableptr); pcre16 *pcre16_compile(PCRE_SPTR16 pattern, int options, const char **errptr, int *erroffset, const unsigned char *tableptr); pcre32 *pcre32_compile(PCRE_SPTR32 pattern, int options, const char **errptr, int *erroffset, const unsigned char *tableptr); Description This function compiles…

PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> void pcre_assign_jit_stack(pcre_extra *extra, pcre_jit_callback callback, void *data); void pcre16_assign_jit_stack(pcre16_extra *extra, pcre16_jit_callback callback, void *data); void pcre32_assign_jit_stack(pcre32_extra *extra, pcre32_jit_callback callback, void *data); Description This function provides control over the memory used as a stack at run-time by a call to pcre[16|32]_exec() with a pattern that has been successfully…

PCRE – Perl-compatible regular expressions #include < pcre.h> Pcre 32-Bit Api Basic Functions pcre32 *pcre32_compile(PCRE_SPTR32 pattern, int options, const char **errptr, int *erroffset, const unsigned char *tableptr); pcre32 *pcre32_compile2(PCRE_SPTR32 pattern, int options, int *errorcodeptr, const unsigned char *tableptr); pcre32_extra *pcre32_study(const pcre32 *code, int options, const char **errptr); void pcre32_free_study(pcre32_extra *extra); int pcre32_exec(const pcre32 *code, const…

PCRE – Perl-compatible regular expressions (revised API) Unicode And Utf Support PCRE2 is normally built with Unicode support, though if you do not need it, you can build it without, in which case the library will be smaller. With Unicode support, PCRE2 has knowledge of Unicode character properties and can process text strings in UTF-8,…

PCRE2 – Perl-compatible regular expressions (revised API) Pcre2 Regular Expression Syntax Summary The full syntax and semantics of the regular expressions that are supported by PCRE2 are described in the pcre2pattern documentation. This document contains a quick-reference summary of the syntax. Quoting   \x         where x is non-alphanumeric is a literal x   \Q…\E    treat enclosed characters as literal…

PCRE2 – Perl-compatible regular expressions (revised API) Pcre2 Discussion Of Stack Usage When you call pcre2_match(), it makes use of an internal function called match(). This calls itself recursively at branch points in the pattern, in order to remember the state of the match so that it can back up and try a different alternative…

PCRE2 – Perl-compatible regular expressions (revised API) Saving And Re-Using Precompiled Pcre2 Patterns int32_t pcre2_serialize_decode(pcre2_code **codes, int32_t number_of_codes, const uint32_t *bytes, pcre2_general_context *gcontext); int32_t pcre2_serialize_encode(pcre2_code **codes, int32_t number_of_codes, uint32_t **serialized_bytes, PCRE2_SIZE *serialized_size, pcre2_general_context *gcontext); void pcre2_serialize_free(uint8_t *bytes); int32_t pcre2_serialize_get_number_of_codes(const uint8_t *bytes); If you are running an application that uses a large number of regular expression…

PCRE2 – Perl-compatible regular expressions (revised API) Pcre2 Sample Program A simple, complete demonstration program to get you started with using PCRE2 is supplied in the file pcre2demo.c in the src directory in the PCRE2 distribution. A listing of this program is given in the pcre2demo documentation. If you do not have a copy of…

PCRE2 – Perl-compatible regular expressions (revised API) Synopsis #include <pcre2posix.h> int pcre2_regcomp(regex_t *preg, const char *pattern, int cflags); int pcre2_regexec(const regex_t *preg, const char *string, size_t nmatch, regmatch_t pmatch[], int eflags); size_t pcre2_regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size); void pcre2_regfree(regex_t *preg); Description This set of functions provides a POSIX-style API for the…