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?

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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