Name: rmT116609 Date: 02/13/2004


FULL PRODUCT VERSION :
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)

java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32c)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b32c, mixed mode)

FULL OS VERSION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
A multiline regexp search may lead to a StringIndexOutOfBoundsException
if the string ends with "\r".


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.StringIndexOutOfBoundsException: String index out of range: 1
at java.lang.String.charAt(String.java:444)
at java.util.regex.Pattern$Caret.match(Pattern.java:2866)
at java.util.regex.Pattern$Start.match(Pattern.java:2806)
at java.util.regex.Matcher.find(Matcher.java:722)
at java.util.regex.Matcher.find(Matcher.java:414)
at java.util.regex.Pattern.split(Pattern.java:937)
at java.util.regex.Pattern.split(Pattern.java:996)
at SplitTest.main(SplitTest.java:9)
Exception in thread "main"

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.regex.Pattern;

public class SplitTest
{
    public static void main(String[] args)
    {
        // Problem only occurs with multiline patterns
        // containing a beginning-of-line caret "^" followed
        // by an expression that also matches the empty string.
        Pattern p = Pattern.compile("^x?", Pattern.MULTILINE);

        // The following line leads to an exception.
        // The exception always occurs with a string
        // ending with "\r". The string may have
        // arbitrary length - this is just the shortest
        // example possible.
        p.split("\r");
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Removing a trailing "\r" from the string in question.
(Incident Review ID: 223169)
======================================================================