How does JDK 6 regexp compare with org.apache.regexp?

I'开发者_开发问答m interested in benchmarks and functionality? Is there are any reason to use Jakarta regexp?

It seems that there is no reasons for that. But there are some other interesting libraries, apart from jakarta one. This link provides some information about performance and perl5 regexps compatibility:

http://tusker.org/regex/regex_benchmark.html