Where in the chomsky hierachy are java/perl regular expressions?

hi,
does anyone know (or of any links that talk about) where java/perl (they are the same?) regular expressions fit in the chomsky hierachy (and which operators take them out of the regular languages?)?
thanks,
asjf

does anyone know (or of any links that talk about)
where java/perl (they are the same?) regular
expressions fit in the chomsky hierachy (and which
operators take them out of the regular languages?)?From a mathmatical viewpoint, regular languages can always be described by regular expressions. I've always assumed java/perl were the same. I looked at the all the possible patterns listed(http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html#sum) and I know I easily could create a finite state machine for any of expressions listed except in the last section. This would prove they are regular languages. The reason I can't do the last section is because I don't understand what they mean. I don't know understand what they mean by things like 'X, via zero-width positive lookahead' and a quick google search didn't give me any good examples/clarifications.

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Where in the chomsky hierachy are java/perl regular expressions?

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