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Re: Patch for lookaround assertion in regexp

From: Nikolai Weibull
Subject: Re: Patch for lookaround assertion in regexp
Date: Tue, 24 Jan 2012 16:09:36 +0100

On Tue, Jan 24, 2012 at 15:40, Stefan Monnier <address@hidden> wrote:

>> As an alternative to PCRE, which, as has already been pointed out,
>> doesn’t match any of these requirements, how about RE2?
>> http://code.google.com/p/re2/
>> It’s written in C++, which is a minus, but it should be simple enough
>> to extend it with \c and \s.

> That might work, indeed (tho someone still has to write the
> corresponding code).
> Note that it does not support lookaround assertions.

True, but you can, as far as I know, not do so without (allowing for)
exponential behavior.

I don’t want to detract from the merits of lookaround assertions (or
start a discussion on the subject), but I’ve always found them to be a
sign of improper use of (no longer) regular expressions.

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