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regex.h, regex - regular expression matching types

#include <regex.h>

The <regex.h> header defines the structures and symbolic constants used by the regcomp(), regexec(), regerror(), and regfree() functions. See regcomp(3C).

The structure type regex_t contains the following member:

size_t re_nsub number of parenthesized subexpressions

The type size_t is defined as described in <sys/types.h>. See types.h(3HEAD).

The type regoff_t is defined as a signed integer type that can hold the largest value that can be stored in either a type off_t or type ssize_t. The structure type regmatch_t contains the following members:

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

Values for the cflags parameter to the regcomp function are as follows:

REG_EXTENDED

REG_ICASE

REG_NOSUB

REG_NEWLINE

Values for the eflags parameter to the regexec() function are as follows:

REG_NOTBOL

REG_NOTEOL

The following constants are defined as error return values:

REG_NOMATCH

REG_BADPAT

REG_ECOLLATE

REG_ECTYPE

REG_EESCAPE

REG_ESUBREG

REG_EBRACK

REG_EPAREN

REG_EBRACE

REG_BADBR

REG_ERANGE

REG_ESPACE

REG_BADRPT

REG_ENOSYS

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Standard

regcomp(3C), types.h(3HEAD), attributes(5), standards(5)