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7.1.9 Freeing GNU Pattern Buffers

To free any allocated fields of a pattern buffer, you can use the POSIX function described in 7.2.6 Freeing POSIX Pattern Buffers, since the type regex_t---the type for POSIX pattern buffers--is equivalent to the type re_pattern_buffer. After freeing a pattern buffer, you need to again compile a regular expression in it (see section 7.1.2 GNU Regular Expression Compiling) before passing it to a matching or searching function.

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