regex.h (0p)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.NAME
regex.h — regular expression matching typesSYNOPSIS
#include <regex.h>
DESCRIPTION
The <regex.h> header shall define the structures and symbolic constants used by the regcomp(), regexec(), regerror(), and regfree() functions. The <regex.h> header shall define the regex_t structure type, which shall include at least the following member:size_t re_nsub Number of parenthesized subexpressions.
regoff_t rm_so Byte offset from start of string to start of substring. regoff_t rm_eo Byte offset from start of string of the first character after the end of substring.
- REG_EXTENDED
- Use Extended Regular Expressions.
- REG_ICASE
- Ignore case in match.
- REG_NOSUB
- Report only success or fail in regexec().
- REG_NEWLINE
- Change the handling of <newline>.
- REG_NOTBOL
- The <circumflex> character ('^'), when taken as a special character, does not match the beginning of string.
- REG_NOTEOL
- The <dollar-sign> ('$'), when taken as a special character, does not match the end of string.
- REG_NOMATCH
- regexec() failed to match.
- REG_BADPAT
- Invalid regular expression.
- REG_ECOLLATE
- Invalid collating element referenced.
- REG_ECTYPE
- Invalid character class type referenced.
- REG_EESCAPE
- Trailing <backslash> character in pattern.
- REG_ESUBREG
- Number in \digit invalid or in error.
- REG_EBRACK
- "[]" imbalance.
- REG_EPAREN
- "\(\)" or "()" imbalance.
- REG_EBRACE
- "\{\}" imbalance.
- REG_BADBR
- Content of "\{\}" invalid: not a number, number too large, more than two numbers, first larger than second.
- REG_ERANGE
- Invalid endpoint in range expression.
- REG_ESPACE
- Out of memory.
- REG_BADRPT
- '?', '*', or '+' not preceded by valid regular expression.
int regcomp(regex_t *restrict, const char *restrict, int); size_t regerror(int, const regex_t *restrict, char *restrict, size_t); int regexec(const regex_t *restrict, const char *restrict, size_t, regmatch_t [restrict], int); void regfree(regex_t *);