Freeing GNU Pattern Buffers

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Freeing GNU Pattern Buffers
---------------------------

  To free any allocated fields of a pattern buffer, you can use the
POSIX function described in See 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 (*note GNU
Regular Expression Compiling::.) before passing it to a matching or
searching function.