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 C Library 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 |
|• Flags for POSIX Regexps||Syntax variations for |
|• Matching POSIX Regexps||Using |
|• 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.|