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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

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About the Author

Jack Handy
Web Developer
United States United States
No Biography provided

Comments and Discussions

 
QuestionMy vote of 5+ PinmemberSanmayce29-Nov-13 8:47 
GeneralMy vote of 5 PinmemberFranc Morales29-May-13 16:47 
Questionhelp required for wilcard matching * and # PinmemberSaimaAsif24-Feb-12 0:56 
GeneralMy vote of 5 PinmemberPlamen Petrov13-Dec-11 22:37 
SuggestionModification with '#' as wildcard joker for digits [modified] PinmemberThomas Haase26-Sep-11 0:16 
QuestionLicence Question Pinmemberrandommark23-Nov-10 1:33 
AnswerAnother C# version, with a twist Pinmembertomlev29-Jun-10 15:50 
GeneralObscurity PinmemberChuck O'Toole25-Apr-10 19:18 
AnswerMy C# contribution - recursive, of course! PinmemberRenniePet26-Mar-10 6:21 
GeneralRe: My C# contribution - recursive, of course! PinmemberErwin de GRoot29-Mar-10 2:58 
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 8:45 
GeneralSorry - revised numbers PinmemberRenniePet29-Mar-10 9:35 
GeneralRe: Depends on whether you need to optimize the last few nanoseconds out of it... PinmemberErwin de GRoot29-Mar-10 9:37 
GeneralYet another version - 25% faster, I think [modified] PinmemberRenniePet1-Apr-10 9:24 
GeneralRe: Yet another version - 25% faster, I think Pinmemberaleks1k21-Sep-11 3:47 
QuestionI used this function but I how I can catch variables from the * ??? Pinmembermoh.hijjawi20-Oct-09 2:55 
AnswerRe: I used this function but I how I can catch variables from the * ??? PinmemberRenniePet1-Apr-10 12:27 
Questionany updates ? Pinmemberalhambra-eidos2-Jul-09 6:12 
GeneralImproved matching with end-of-text PinmemberAnders Heie11-May-09 16:20 
GeneralRe: Improved matching with end-of-text: some cases don't work properly! Pinmemberroadrunner31412-Aug-09 4:35 
GeneralRe: Improved matching with end-of-text: some cases don't work properly! Pinmembersdiazdiaz20-Jun-13 2:50 
QuestionPathMatchSpec instead? Pinmemberkintz25-Mar-09 9:55 
AnswerRe: PathMatchSpec instead? PinmemberMandatoryDefault31-Aug-09 11:39 
Questionwchar_t version? Pinmemberrmorales8729-Nov-08 21:16 
AnswerRe: wchar_t version? Pinmemberrazvar31-Mar-11 22:49 

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