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  1. #1
    hiklior is offline Member
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    Apr 2008
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    Default Regular Expression Challange

    i need to creat a little regular expression here are the conditions, I know i looks weired but this is what i need.
    Any help will be appreciated
    First, i need to find 35 consecutive zeros(00000000000000000000000000000000000) from a text file and they could be more than one place. If i find them i need 9th 10th and 11th position value and then put a space then i need 16th and 17th position value and then a space and then 18th and 19th position value and then put a space and then those 35 zeros.
    11135781222111122330000000000000000000000000000000 00000
    Output should be
    222 22 33 00000000000000000000000000000000000

    I hope this makes sense

  2. #2
    xfrag's Avatar
    xfrag is offline Member
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    Apr 2008
    Athens, Greece
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    Well I'm not sure I understood correctly what are you trying to do, but I can help you find the zeros. Use the following code:
    Java Code:
    try {
        Pattern p = Pattern.compile("0{2,}");
        Matcher m = p.matcher("11135781222111122330000000000000000000000000000000 00000");
        int idx = -1;
        String output = "";
        while (!m.hitEnd() && m.find()) {
                if(idx == -1){
                    idx = m.start();
                output +=;                    
        if(output.length() >= 35){
               System.out.println("Found 35 consecutive zeros:");
               System.out.println("Start index: " + idx);
    } catch (Exception matchEx) {
    This way you also have the index of the fist zero in the sequence, so you can get the "n-th" characters you're looking for, append them at the front of the output, add spaces where needed and you're done! ;)

    Note: I don't know if ALL your requirements can be met using a single regular expression, and I think they cannot.

  3. #3
    sukatoa's Avatar
    sukatoa is offline Senior Member
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    Jan 2008
    Cebu City, Philippines
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    Try to have an experiment about split(String regex) method
    freedom exists in the world of ideas

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