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The GNU C Library

10.3 Regular Expression Matching

The GNU C library supports two interfaces for matching regular expressions. One is the standard POSIX.2 interface, and the other is what the GNU system has had for many years.

Both interfaces are declared in the header file `regex.h'. If you define _POSIX_C_SOURCE, then only the POSIX.2 functions, structures, and constants are declared.

10.3.1 POSIX Regular Expression Compilation		Using regcomp to prepare to match.
10.3.2 Flags for POSIX Regular Expressions		Syntax variations for regcomp.
10.3.3 Matching a Compiled POSIX Regular Expression		Using regexec to match the compiled pattern that you get from regcomp.
10.3.4 Match Results with Subexpressions		Finding which parts of the string were matched.
10.3.5 Complications in Subexpression Matching		Find points of which parts were matched.
10.3.6 POSIX Regexp Matching Cleanup		Freeing storage; reporting errors.