fnmatch() doesn't work with character classes?

[Dustin Boyd]

fnmatch() does not appear to work with character classes or character 
equivalents. regcomp(), however, does work with character classes, but not 
character equivalents. Is this behavior one should expect? I've tested with 
Debian, and it matches in both cases.

I sent this to the Cygwin ML rather than the Newlib ML just because of the fact 
that it may be locale-related, which is a problem on Cygwin's end, not 
Newlib's, if it's a problem at all.

The attached program will hopefully illustrate the trouble occurring on my 
Windows 10 machine:

regexec: 0 matched /[[:digit:]]/
fnmatch: 0 did not match /[[:digit:]]/
-- 
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#define _XOPEN_SOURCE 700
#include <assert.h>
#include <fnmatch.h>
#include <regex.h>
#include <stdio.h>

int
main (void)
{
  regex_t reg;
  const char *pattern = "[[:digit:]]";
  const char *s = "0";
  int cflags = REG_NOSUB;

  assert(regcomp(&reg, pattern, cflags) == 0);
  if (regexec(&reg, s, 0, NULL, 0) == REG_NOMATCH)
    {
      printf("regexec: %s did not match /%s/\n", s, pattern);
    }
  else
    {
      printf("regexec: %s matched /%s/\n", s, pattern);
    }
  regfree(&reg);

  if (fnmatch(pattern, s, 0) == FNM_NOMATCH)
    {
      printf("fnmatch: %s did not match /%s/\n", s, pattern);
    }
  else
    {
      printf("fnmatch: %s matched /%s/\n", s, pattern);
    }
}

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