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Re^2: what would you like to see in perl5.12?

by sgt (Deacon)
on Aug 22, 2007 at 20:56 UTC ( #634523=note: print w/replies, xml ) Need Help??

in reply to Re: what would you like to see in perl5.12?
in thread what would you like to see in perl5.12?

Yes. I do agree completely. This opens the realm of stream regexps and would facilitate greatly the construction of regexp-based tokenizer (scalar m//gc) which need to process their input in chunks. Currently you need to resort to contorted hacks to do stream tokenizing, a pity as this limits the implementation of generic parser generators in pure Perl.

What is needed is a way to keep the state of the regexp engine at the end of the buffer -- end-of-buffer-match case--, so that when you add another chunk, the engine does not start again from the beginning. Considering all the goodies added by demerphq, maybe there is hope ;) to see something soon.

Also I'd like to be able to switch to a smaller but faster regexp implementation just for a block. Or maybe be able to turn off parts of the main engine -- locally -- that I know I am not going to use in a given block (supposing that doing so gives extra speed of course).

cheers --stephan
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