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lisp
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I read an article about autoboxing surprises in Java 1.5/5/V/quinquies/five-o a week or two ago (that link is a repeat that came up when I googled), and noticed a few links back to the conversation in lambda or whatever.
I read the following from the regexp2 module for ACL.
- The new matcher uses Perl syntax, and is nearly feature compatible with Perl. Only a few obscure features have not been implemented.
- Speed: the new matcher was designed to be fast. On the CL-PPCRE test suite (with 1600+ tests) it is on average 30% faster than Perl.
Of course, the smartarse in me immediately responds,"What, the useful few obscure features?" I think every regexp feature in Perl can be called "obscure" by some party.