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Thread: Please match this

  1. #1
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    Default Please match this

    I am trying unsuccessfully to use Java to match a line so I can use particular parts of the line. The String line is:
    String line = "-rw-rw-r-- 1 sherman sherman 0 Feb 14 12:17 nonpedalSwing";
    I am using Pattern and Matcher. This is an example of how I want to seperate the line so I can use sub 2, sub 3, and sub 5.
    String Pattern = "^(-rw-rw-r-- 1 sherman sherman 0)(Feb)(14)( 12:17 )(nonpedalSwing)";
    This does not work for me:
    String Pattern = "^(-\\w+-\\w+-\\w--\\s\\d\\s\\w+\\s\\w+\\s+\\d\\s)(\\w+)(\\s)(\\d+)(\ \s\\d+:\\d+\\s)(\\w+)";
    At the end of this message is the code I am playing with.
    How would you do it?

    Thanks; Sherman

    import java.util.regex.Matcher;
    import java.util.regex.Pattern;

    public class equalEquals
    {
    /**
    * Constructor for objects of class equalEquals
    */
    public static void main(String arg[])
    {
    String line = "-rw-rw-r-- 1 sherman sherman 0 Feb 14 12:17 nonpedalSwing";

    // Create a Pattern object
    String pattern = "^(\\w+)(\\s)(\\d+)(\\s)(\\w+)";
    Pattern r = Pattern.compile(pattern);

    // Create a Matcher object
    Matcher m = r.matcher(line);
    if (m.find()) {
    System.out.println("Found value: \"" + m.group(0) + "\"");
    System.out.println("Found value: \"" + m.group(1) + "\"");
    System.out.println("Found value: \"" + m.group(2) + "\"");
    System.out.println("Found value: \"" + m.group(3) + "\"");
    // System.out.println("Found value: \"" + m.group(4) + "\"");
    } else {
    System.out.println("No match");
    }

    }
    }

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Please match this

    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Please match this

    Please accept my apologies. I didn't know about cross posting until code ranch posted the 7 years ago cross posting post. How do I now correct this?

  4. #4
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    Default Re: Please match this

    Start by documenting the regex symbols that you are using in the pattern. For example:
            // Create a Pattern object
            // ^	The beginning of a line
            // () denotes a capturing group.
    Finish the list for the pattern you have coded.
    Then compare the patterns against the actual String being matched.


    What is the desired printout?

    So far this is what I get:
    Found value: "-rw-rw-r-- 1 sherman"
    Found value: "-rw-rw-r--"
    Found value: " "
    Found value: "1"
    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Please match this

    Thank you to all now how do I close and mark this as solved? Sherman

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Please match this

    Can you post your solution?
    If you don't understand my answer, don't ignore it, ask a question.

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