The regcomp function in current CVS and Fedora rawhide no longer accepts
dual-bracket regular expressions.

This piece of code works on GNU libc <= 2.3.5, FreeBSD and OpenBSD without
problems, but with the additional regcomp change that has been done to CVS this
piece of code returns 7, which means a problem with brackets (missing ] while
opened with [ for example). This issue also affects tools like grep.

#include <sys/types.h>
#include <regex.h>
#include <stdlib.h>
#include <stdio.h>

int
main (int argc, char **argv)
{
  int err;
  regex_t r;
  err = regcomp (&r, "[[:space:]]", REG_EXTENDED);
  if (err != 0) {
    printf("%d\n", err);
  }
  return 0;
}