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7.2.6 Freeing POSIX Pattern Buffers

To free any allocated fields of a pattern buffer, use:

regfree (regex_t *preg)

preg is the pattern buffer whose allocated fields you want freed. regfree also sets preg's allocated and used fields to zero. After freeing a pattern buffer, you need to again compile a regular expression in it (see section 7.2.2 POSIX Regular Expression Compiling) before passing it to the matching function (see section 7.2.3 POSIX Matching).

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