[Shootout-list] Java Regular-expression pattern-matching code

[Paul Lofte]

Thought it would be nice to simplify the code a bit.
Since we're using sun 1.4.2_05 I figured why not use the regex utilities
provided. =20
For this example I didn't see the need to use a different api.
=20
>From past messages on the board, it looks like people just post the code
along with the message.
I'm not really sure about the etiquette, just wanted to contribute.

-Paul=20
=20
Here's the code:

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
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public class regexmatch {
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public static void main(String args[]) {
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        try {
            String regex =3D "(^|^\\D*[^\\(\\d])"     // must be =
preceeded
by non-digit
                + "((\\(\\d\\d\\d\\))|(\\d\\d\\d))" // match 2: Area
Code inner match 3: area with perens,=20
                                                    //
inner match 4: without perens=20
                + "[ ]"                             // area code
followed by one space
                + "(\\d\\d\\d)"                     //match 5: prefix of
3 digits
                + "[ -]"                            // prefix followed
by space or dash
                + "(\\d\\d\\d\\d)"                  // match 6: last 4
digits
                + "(\\D*$)";                        // followed by non
numeric chars=20
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            Pattern phonePattern =3D Pattern.compile(regex);
            BufferedReader in =3D new BufferedReader(new
InputStreamReader(System.in));
            String line;
            int count =3D 0;
            while ((line =3D in.readLine()) !=3D null) {
                Matcher match =3D phonePattern.matcher(line);
                if (match.matches()) {
                    count++;
                    if (match.group(3) !=3D null) {
                        System.out.println(count + ": "=20
                                          + match.group(3) + " "=20
                                          + match.group(5) + "-"=20
                                          + match.group(6));
                    } else {
                        System.out.println(count + ": ("=20
                                          + match.group(4) + ") "=20
                                          + match.group(5) + "-"=20
                                          + match.group(6));
                    }
                }
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            }
            in.close();
        } catch (IOException e) {
            System.err.println(e);
        }
        System.exit(0);
    }

}