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Thread: Pattern class

  1. #1
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    Default Pattern class

    I read this book , Thinking in Java and I can't understand how did he managed to store this 2nd line of code (String , and regex) inside of args. Please help me. This bugs me all day. Here's program and output :


    // Allows you to easily try out regular expressions.
    // {Args: abcabcabcdefabc "abc+" "(abc)+" "(abc){2,}" }
    import java.util.regex.*;
    import static net.mindview.util.Print.*;
    public class TestRegularExpression {
    public static void main(String[] args) {
    if(args.length < 2) {
    print("Usage:\njava TestRegularExpression " +
    "characterSequence regularExpression+");
    System.exit(0);
    }
    print("Input: \"" + args[0] + "\"");
    for(String arg : args) {
    print("Regular expression: \"" + arg + "\"");
    Pattern p = Pattern.compile(arg);
    Matcher m = p.matcher(args[0]);

    while(m.find()) {

    print("Match \"" + m.group() + "\" at positions " +
    m.start() + "-" + (m.end() - 1));
    }
    }
    }

    Output:
    Input: "abcabcabcdefabc"
    Regular expression: "abcabcabcdefabc"
    Match "abcabcabcdefabc" at positions 0-14
    Regular expression: "abc+"
    Match "abc" at positions 0-2
    Match "abc" at positions 3-5
    Match "abc" at positions 6-8
    Match "abc" at positions 12-14
    Regular expression: "(abc)+"
    Match "abcabcabc" at positions 0-8
    Match "abc" at positions 12-14
    Regular expression: "(abc){2,}"
    Match "abcabcabc" at positions 0-8


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Pattern class

    Please edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.

    Be sure to properly format the code so it has indentations that shows the logic nesting levels. All statements should NOT start in the first column.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Pattern class

    [code == java ]

    < // Allows you to easily try out regular expressions.
    // {Args: abcabcabcdefabc "abc+" "(abc)+" "(abc){2,}" }
    import java.util.regex.*;
    import static net.mindview.util.Print.*;
    public class TestRegularExpression {
    public static void main(String[] args) {
    if(args.length < 2) {
    print("Usage:\njava TestRegularExpression " +
    "characterSequence regularExpression+");
    System.exit(0);
    }
    print("Input: \"" + args[0] + "\"");
    for(String arg : args) {
    print("Regular expression: \"" + arg + "\"");
    Pattern p = Pattern.compile(arg);
    Matcher m = p.matcher(args[0]);

    while(m.find()) {

    print("Match \"" + m.group() + "\" at positions " +
    m.start() + "-" + (m.end() - 1));
    }
    }
    }>

    [/code]

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Pattern class

    Please fix the code tags in your post. See post#2


    Be sure to properly format the code so it has indentations that shows the logic nesting levels. All statements should NOT start in the first column.
    If you don't understand my answer, don't ignore it, ask a question.

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