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Wildcard string compare (globbing)

, 15 Feb 2005
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Matches a string against a wildcard string such as "*.*" or "bl?h.*" etc. This is good for file globbing or to match hostmasks.

Usage:

This is a fast, lightweight, and simple pattern matching function.

if (wildcmp("bl?h.*", "blah.jpg")) {
  //we have a match!
} else {
  //no match =(
}

Function:

int wildcmp(const char *wild, const char *string) {
  // Written by Jack Handy - <A href="mailto:jakkhandy@hotmail.com">jakkhandy@hotmail.com</A>
  const char *cp = NULL, *mp = NULL;

  while ((*string) && (*wild != '*')) {
    if ((*wild != *string) && (*wild != '?')) {
      return 0;
    }
    wild++;
    string++;
  }

  while (*string) {
    if (*wild == '*') {
      if (!*++wild) {
        return 1;
      }
      mp = wild;
      cp = string+1;
    } else if ((*wild == *string) || (*wild == '?')) {
      wild++;
      string++;
    } else {
      wild = mp;
      string = cp++;
    }
  }

  while (*wild == '*') {
    wild++;
  }
  return !*wild;
}

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Jack Handy
Web Developer
United States United States
No Biography provided

Comments and Discussions

 
AnswerMy C# contribution - recursive, of course! PinmemberRenniePet26-Mar-10 5:21 
GeneralRe: My C# contribution - recursive, of course! PinmemberErwin de GRoot29-Mar-10 1:58 
Actually, the recursive function together with substring will make this slow.
I'm using this at the moment:
    public static class StringExtensions
    {
        public static bool WildcardMatch(this string str, string compare, bool ignoreCase) 
        { 
            if (ignoreCase)
                return str.ToLower().WildcardMatch(compare.ToLower()); 
            else
                return str.WildcardMatch(compare); 
        }
 
        public static bool WildcardMatch(this string str, string compare)
        {
            if (string.IsNullOrEmpty(compare))
                return str.Length == 0;
            int pS = 0;
            int pW = 0;
            int lS = str.Length;
            int lW = compare.Length;
            
            while (pS < lS && pW < lW && compare[pW] != '*')
            {
                char wild = compare[pW];
                if (wild != '?' && wild != str[pS])
                    return false;
                pW++;
                pS++;
            }
 
            int pSm = 0;
            int pWm = 0;
            while (pS < lS && pW < lW)
            {
                char wild = compare[pW];
                if (wild == '*')
                {
                    pW++;
                    if (pW == lW)
                        return true;
                    pWm = pW;
                    pSm = pS + 1;
                }
                else if (wild == '?' || wild == str[pS])
                {
                    pW++;
                    pS++;
                }
                else
                {
                    pW = pWm;
                    pS = pSm;
                    pSm++;
                }
            }
            while (pW < lW && compare[pW] == '*')
                pW++;
            return pW == lW && pS == lS; 
        }
    }

GeneralDepends on whether you need to optimize the last few nanoseconds out of it... PinmemberRenniePet29-Mar-10 7:45 
GeneralSorry - revised numbers PinmemberRenniePet29-Mar-10 8:35 
GeneralRe: Depends on whether you need to optimize the last few nanoseconds out of it... PinmemberErwin de GRoot29-Mar-10 8:37 
GeneralYet another version - 25% faster, I think [modified] PinmemberRenniePet1-Apr-10 8:24 
GeneralRe: Yet another version - 25% faster, I think Pinmemberaleks1k21-Sep-11 2:47 

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