Click here to Skip to main content
13,190,404 members (53,682 online)
Click here to Skip to main content
Add your own
alternative version

Stats

932.1K views
97 bookmarked
Posted 1 May 2001

Wildcard string compare (globbing)

, 15 Feb 2005
Rate this:
Please Sign up or sign in to vote.
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

Share

About the Author

Jack Handy
Web Developer
United States United States
No Biography provided

You may also be interested in...

Comments and Discussions

 
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 
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 
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! 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 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

Permalink | Advertise | Privacy | Terms of Use | Mobile
Web02 | 2.8.171016.2 | Last Updated 15 Feb 2005
Article Copyright 2001 by Jack Handy
Everything else Copyright © CodeProject, 1999-2017
Layout: fixed | fluid