I'm a very happy oro user because it matches the perl5.x regexps best.
Speed is not really an issue for me as I use it merely in batch like
processes. Rarely in reallife internet apps.
I would recommend boycotting Sun and their regexp, as they ccuurently
copy-paste all the nice open source code in
Read the archives there are several posts on this, with reasonably details
comparisons. From memory I believe that there were instances where Oro was
faster and instances where Java Regexp was faster depending on the input and
the regular expression used. But read the archive theres more detail
