Problem with ^ and Pattern.MUTLILINE with replaceAll()....

    //////////////////////////////////////////////////////////////////////
    import java.util.regex.*;
    public class test1 {
public static void main(String [] args) {
Pattern p = Pattern.compile("^", Pattern.MULTILINE);
Matcher m = p.matcher("this is some text");
System.out.println(m.replaceAll("X"));

// prints "XtXhXiXsX XiXsX XsXoXmXeX XtXeXxXtX"
// expected "Xthis is some text"
}
    }
    //////////////////////////////////////////////////////////////////////



If you remove Pattern.MULTILINE.........

    //////////////////////////////////////////////////////////////////////
    import java.util.regex.*;
    public class test2 {
public static void main(String [] args) {
Pattern p = Pattern.compile("^");
Matcher m = p.matcher("this is some text");
System.out.println(m.replaceAll("X"));

// raises: StringIndexOutOfBoundsException
// expected "Xthis is some text"
}
    }

Name: bsC130419 Date: 07/23/2001


C:\java>java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b65)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b65, mixed mode)

C:\java>

Here's the test program...

import java.util.regex.*;

public class Foo {

    public static void main(String[] args) {
        System.out.println("Match test...");
        Pattern p = Pattern.compile("(^.*$){4,}", Pattern.MULTILINE);
        Matcher m = p.matcher("aaaa\nbbbb\n");
        while (m.find()) {
            System.out.println("Match (" + m.start() + "," + m.end() + "): '"
                    + m.group() + "'");
        }
    }
}


And here's the output...

C:\java>java Foo
Match test...
Match (0,10): 'aaaa
bbbb
'
Match (10,10): ''

C:\java>

I would expect that since the input has fewer than than 4 lines, there should
be no matches. The last match is really bizarre. It's the same with \r\n as
the line terminator as well.
(Review ID: 128589)
======================================================================