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(libc.info)Regular Expressions

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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.

POSIX Regexp Compilation

Using `regcomp' to prepare to match.

Flags for POSIX Regexps

Syntax variations for `regcomp'.

Matching POSIX Regexps

Using `regexec' to match the compiled

pattern that you get from `regcomp'.

Regexp Subexpressions

Finding which parts of the string were matched.

Subexpression Complications

Find points of which parts were matched.

Regexp Cleanup

Freeing storage; reporting errors.