Tim Bray compares Perl and Java regular expression performance with the result of Java performing twice as fast as Perl when output performance is factored out. Fantastic. I knew Java regular expression library was fast but I didn't know it was this fast. Even more encouraging, there are even faster third party regular expression libraries for Java. I wonder if .NET 2.0 makes up for the lackluster RegEx performance in .NET 1.1.
Jeff Atwood is getting completely different result (.NET RE faster by ~40%) from an informal benchmark I did a while back (.NET slower by ~60%). BTW, I don't believe .NET RE is 20 times slower than Java RE.