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Wildcard string compare (globbing)

, 15 Feb 2005 818.9K 94
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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.

A list of licenses authors might use can be found here

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About the Author

Jack Handy
Web Developer
United States United States
No Biography provided

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Comments and Discussions

 
GeneralRe: wildcmp(&quot;*&amp;lt;*&amp;gt;&quot;, &quot;&amp;lt;field1&amp;gt;&amp;lt;field2&amp;gt;&quot;) not working Pin
radboudp16-Feb-07 0:35
memberradboudp16-Feb-07 0:35 
Generalreturn value type Pin
wdx048-Jan-06 15:49
memberwdx048-Jan-06 15:49 
General*? case match Pin
talimu3-Nov-05 23:42
membertalimu3-Nov-05 23:42 
GeneralRe: *? case match Pin
kuhnm15-Sep-06 2:18
memberkuhnm15-Sep-06 2:18 
GeneralRe: *? case match Pin
kuhnm18-Sep-06 4:48
memberkuhnm18-Sep-06 4:48 
GeneralGets my 5 Pin
Franc Morales18-Oct-05 17:05
memberFranc Morales18-Oct-05 17:05 
Generalmp and cp Pin
twopieman15-Mar-05 11:59
membertwopieman15-Mar-05 11:59 
GeneralRe: mp and cp Pin
radboudp16-Feb-07 1:14
memberradboudp16-Feb-07 1:14 
GeneralOK, but ... Pin
Sam Levy16-Feb-05 4:48
memberSam Levy16-Feb-05 4:48 
QuestionWhy make 3 loop ? Pin
DarkYoda Mickael2-Feb-05 22:22
memberDarkYoda Mickael2-Feb-05 22:22 
AnswerRe: Why make 3 loop ? Pin
Jack Handy13-Feb-05 10:02
memberJack Handy13-Feb-05 10:02 
GeneralC# version Pin
Sancy26-Oct-04 6:23
memberSancy26-Oct-04 6:23 
GeneralRe: C# version Pin
Psyk6621-Dec-04 3:39
sussPsyk6621-Dec-04 3:39 
GeneralRe: C# version Pin
Ionut FIlip22-Feb-05 6:15
memberIonut FIlip22-Feb-05 6:15 
GeneralRe: C# version Pin
robagar3-Apr-06 16:58
memberrobagar3-Apr-06 16:58 
hiya

Just thought I'd share my version of this code

- put the whole shebang into a class with public static methods
- fixed a bug where the pattern '?' matches all strings
- added an early-exit test for patterns that don't actually contain wildcards so it just defaults to normal string comparison

cheers
Rob




     /// <summary>
     /// Class providing wildcard string matching.
     /// </summary>
     public class Wildcard
     {
          private Wildcard()
          {
          }

          /// <summary>
          /// Array of valid wildcards
          /// </summary>
          private static char[] Wildcards = new char[]{'*', '?'};

          /// <summary>
          /// Returns true if the string matches the pattern which may contain * and ? wildcards.
          /// Matching is done without regard to case.
          /// </summary>
          /// <param name="pattern"></param>
          /// <param name="s"></param>
          /// <returns></returns>
          public static bool Match(string pattern, string s)
          {
               return Match(pattern, s, false);
          }

          /// <summary>
          /// Returns true if the string matches the pattern which may contain * and ? wildcards.
          /// </summary>
          /// <param name="pattern"></param>
          /// <param name="s"></param>
          /// <param name="caseSensitive"></param>
          /// <returns></returns>
          public static bool Match(string pattern, string s, bool caseSensitive)
          {
               // if not concerned about case, convert both string and pattern
               // to lower case for comparison
               if (!caseSensitive)
               {
                    pattern = pattern.ToLower();
                    s = s.ToLower();
               }

               // if pattern doesn't actually contain any wildcards, use simple equality
               if (pattern.IndexOfAny(Wildcards) == -1)
                    return (s == pattern);

               // otherwise do pattern matching
               int i=0;
               int j=0;
               while (i < s.Length && j < pattern.Length && pattern[j] != '*')
               {
                    if ((pattern[j] != s[i]) && (pattern[j] != '?'))
                    {
                         return false;
                    }
                    i++;
                    j++;
               }

               // if we have reached the end of the pattern without finding a * wildcard,
               // the match must fail if the string is longer or shorter than the pattern
               if (j == pattern.Length)
                    return s.Length == pattern.Length;
         
               int cp=0;
               int mp=0;
               while (i < s.Length)
               {
                    if (j < pattern.Length && pattern[j] == '*')
                    {
                         if ((j++)>=pattern.Length)
                         {
                              return true;
                         }
                         mp = j;
                         cp = i+1;
                    }
                    else if (j < pattern.Length && (pattern[j] == s[i] || pattern[j] == '?'))
                    {
                         j++;
                         i++;
                    }
                    else
                    {
                         j = mp;
                         i = cp++;
                    }
               }
         
               while (j < pattern.Length && pattern[j] == '*')
               {
                    j++;
               }

               return j >= pattern.Length;
          }
     }

GeneralRe: C# version Pin
Sancy5-Jun-06 16:01
memberSancy5-Jun-06 16:01 
GeneralConvert to java base on C# version [modified, better look :~ ] Pin
quangtin321-Mar-08 21:13
memberquangtin321-Mar-08 21:13 
GeneralRe: C# version - an error! Pin
Mark T.4-Jul-08 14:37
memberMark T.4-Jul-08 14:37 
GeneralRe: C# version Pin
williamhix17-Oct-08 22:28
memberwilliamhix17-Oct-08 22:28 
GeneralMany thanks, with 1 small gripe .. Pin
David Patrick29-Sep-04 8:41
memberDavid Patrick29-Sep-04 8:41 
GeneralRe: Many thanks, with 1 small gripe .. Pin
Jack Handy6-Oct-04 8:13
memberJack Handy6-Oct-04 8:13 
GeneralRe: Many thanks, with 1 small gripe .. Pin
Vic Mackey16-Oct-04 19:33
memberVic Mackey16-Oct-04 19:33 
GeneralRe: Many thanks, with 1 small gripe .. Pin
Voja Intermajstor24-Nov-04 23:26
memberVoja Intermajstor24-Nov-04 23:26 
GeneralNice code... Pin
voja2125-Aug-04 2:30
membervoja2125-Aug-04 2:30 
GeneralSlight efficiency improvement Pin
Bill Buklis9-Jul-04 6:53
memberBill Buklis9-Jul-04 6:53 

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