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To free any allocated fields of a pattern buffer, use the POSIX
function regfree:
void regfree (regex_t *preg)
preg is the pattern buffer whose allocated fields you want freed;
this works because since the type regex_t—the type for
POSIX pattern buffers—is equivalent to the type
re_pattern_buffer.
regfree also sets preg’s allocated field to zero.
After a buffer has been freed, it must have a regular expression
compiled in it before passing it to a matching or searching function.