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Wildcard string compare (globbing)

By , 15 Feb 2005
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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

About the Author

Jack Handy
Web Developer
United States United States
No Biography provided

Comments and Discussions

 
GeneralRe: mp and cp Pinmemberradboudp16-Feb-07 1:14 
GeneralOK, but ... PinmemberSam Levy16-Feb-05 4:48 
QuestionWhy make 3 loop ? PinmemberDarkYoda Mickael2-Feb-05 22:22 
AnswerRe: Why make 3 loop ? PinmemberJack Handy13-Feb-05 10:02 
GeneralC# version PinmemberSancy26-Oct-04 6:23 
GeneralRe: C# version PinsussPsyk6621-Dec-04 3:39 
GeneralRe: C# version PinmemberIonut FIlip22-Feb-05 6:15 
GeneralRe: C# version Pinmemberrobagar3-Apr-06 16:58 
GeneralRe: C# version PinmemberSancy5-Jun-06 16:01 
GeneralConvert to java base on C# version [modified, better look :~ ] Pinmemberquangtin321-Mar-08 21:13 
Java version
We (Qn & Qg) just search and replace to procedure this java version,
    public static boolean matcher(String value, String pattern) {
        if (pattern == null || value == null) {
            return false;
        }
 
        char[] Wildcards = new char[]{'*', '?'};
 
        pattern = pattern.toLowerCase();
        value = value.toLowerCase();
 
        // if pattern doesn't actually contain any wildcards, use simple equality
        if (pattern.indexOf(Wildcards[0]) == -1 && pattern.indexOf(Wildcards[1]) == -1) {
            return value.equals(pattern);
        }
 
        // otherwise do pattern matching
        int i = 0;
        int j = 0;
        while (i < value.length() && j < pattern.length() && pattern.charAt(j) != '*') {
            if (pattern.charAt(j) != value.charAt(i) && pattern.charAt(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 value.length() == pattern.length();
        }
 
        int cp = 0;
        int mp = 0;
        while (i < value.length()) {
            if (j < pattern.length() && pattern.charAt(j) == '*') {
                if ((j++) >= pattern.length()) {
                    return true;
                }
                mp = j;
                cp = i + 1;
            }
            else if (j < pattern.length() && (pattern.charAt(j) == value.charAt(i) || pattern.charAt(j) == '?')) {
                j++;
                i++;
            }
            else {
                j = mp;
                i = cp++;
            }
        }
 
        while (j < pattern.length() && pattern.charAt(j) == '*') {
            j++;
        }
 
        return j >= pattern.length();
    }
 
Unit test
  public void testmatcher() {
        System.out.println("testmatcher");
 
        String[][] matchPaire = {
            {"", ""},
            {"aa", "aa"},
            {"aa", "*"}, //value,pattern
            {"a", "?"},
            {"sdwerporasl;df", "*"},
            {"absdf zzzy", "*zzy"},
            {"abc", "*?"}};
 
        String[][] notMatchPaire = {
            {"", "?"},
            {"ab", "?"},
            {null, null},
            {"", "*a"},
            {"bsadfasdfwer234", "a*"},
            {"a fwer234", "*a"},
            };
 
        for (int i = 0; i < matchPaire.length; i++) {
            System.out.print("paire " + matchPaire[i][0] + " " + matchPaire[i][1]);
            assertTrue(ExchUtils.matcher(matchPaire[i][0], matchPaire[i][1]));
            System.out.println(" ok");
        }
 
        for (int i = 0; i < notMatchPaire.length; i++) {
            System.out.print("paire " + notMatchPaire[i][0] + " " + notMatchPaire[i][1]);
            assertFalse(ExchUtils.matcher(notMatchPaire[i][0], notMatchPaire[i][1]));
            System.out.println(" ok");
        }
    }
 
thank you all.
 
ktmt's member.
modified on Sunday, March 30, 2008 12:42 PM

GeneralRe: C# version - an error! PinmemberMark T.4-Jul-08 14:37 
GeneralRe: C# version Pinmemberwilliamhix17-Oct-08 22:28 
GeneralMany thanks, with 1 small gripe .. PinmemberDavid Patrick29-Sep-04 8:41 
GeneralRe: Many thanks, with 1 small gripe .. PinmemberJack Handy6-Oct-04 8:13 
GeneralRe: Many thanks, with 1 small gripe .. PinmemberVic Mackey16-Oct-04 19:33 
GeneralRe: Many thanks, with 1 small gripe .. PinmemberVoja Intermajstor24-Nov-04 23:26 
GeneralNice code... Pinmembervoja2125-Aug-04 2:30 
GeneralSlight efficiency improvement PinmemberBill Buklis9-Jul-04 6:53 
GeneralRe: Slight efficiency improvement PinmemberBill Buklis9-Jul-04 7:19 
QuestionPathMatchSpec (shlwapi.h)? Pinmemberpeterchen28-Jun-04 6:56 
AnswerRe: PathMatchSpec (shlwapi.h)? PinmemberJack Handy13-Feb-05 9:56 
GeneralDoesnt seem to work well.. PinsussBikram Singh13-May-04 1:56 
GeneralRe: Doesnt seem to work well.. PinmemberJack Handy21-Jun-04 9:13 
GeneralCase Insensitive wildcmp PinmemberTechiex16-Mar-04 9:36 
GeneralRe: Case Insensitive wildcmp PinmemberNeville Franks16-Mar-04 9:52 
GeneralRe: Case Insensitive wildcmp PinmemberTechiex23-Mar-04 9:33 
GeneralRe: Case Insensitive wildcmp PinmemberDavidCrow23-Feb-05 2:24 
GeneralRe: Case Insensitive wildcmp PinmemberVic Mackey23-Feb-05 8:00 
GeneralRe: Case Insensitive wildcmp PinmemberDavidCrow23-Feb-05 8:22 
GeneralRe: Case Insensitive wildcmp Pinmemberf_randy12-Jun-06 18:13 
GeneralExcellent code! PinmemberHans Dietrich16-Jul-03 19:40 
Generalchecking for null PinmemberJack Handy13-Mar-03 20:38 
GeneralRe: checking for null PinsussAnonymous15-Mar-03 20:10 
GeneralRe: checking for null PinmemberJack Handy18-Mar-03 13:25 
Generalgreat code, but ... PinsussAnonymous12-Mar-03 3:17 
GeneralRe: great code, but ... PinmemberJack Handy13-Mar-03 20:34 
GeneralRe: great code, but ... PinsussAnonymous15-Mar-03 20:08 
GeneralRe: great code, but ... PinmemberJack Handy18-Mar-03 13:25 
GeneralRe: great code, but ... PinsussAnonymous19-Mar-03 23:13 
GeneralNice PinmemberChris Richardson16-Jan-03 10:58 
GeneralRe: Nice PinmemberJack Handy20-Jan-03 11:56 
GeneralCool Code PinsussAnonymous6-Dec-02 11:09 
GeneralRe: Cool Code Pinmemberhector santos1-Mar-03 1:53 
GeneralRe: Cool Code PinsussKent C. Dorner2-Mar-03 5:32 
GeneralRe: Cool Code Pinmembergebrudergrimm28-Dec-03 10:18 
GeneralRe: Cool Code PinmemberBrcKcc15-Jun-04 8:18 
GeneralYes man - you a really cool developer PinmemberStanislav Panasik23-Oct-02 19:06 
GeneralRe: Yes man - you a really cool developer PinsussAnonymous28-Mar-04 13:43 
GeneralPseudo Code... Pinmemberblahblah18-Apr-02 10:45 
GeneralRe: Pseudo Code... PinmemberTargys8-Jan-03 2:43 

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