rem: regfree (preg) regex_t *preg;
add: regfree (regex_t *preg)
context: regfree (preg)    regex_t *preg;{  if (preg->buffer != NULL)    free (preg->buffer);  preg->buffer = NULL;  preg->allocated = 0;  preg->used = 0;  if (preg->fastmap != NULL)    free (preg->fastmap);  preg->fastmap = NULL;  preg->fastmap_accurate = 0;  if (preg->translate != NULL)    free (preg->translate);  preg->translate = NULL;}