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List:       kfm-devel
Subject:    RE: Fwd: Regular expression library choices
From:       Yves Arrouye <yves () realnames ! com>
Date:       2001-11-06 2:22:42
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> expressions.  In fact, as I said in the thread on the KDE-Devel mailing
> list, the only thing that I see missing from the regex++ syntax that is
> in the normal Perl 5 syntax (upon which ECMAScript RegEx objects are
> modelled) is positive and negative lookahead assertions:
> 
>    (?=...)    positive lookahead assertion
>    (?!...)    negative lookahead assertion
> 
> These are, at least in my experience, used very infrequently.  There are
> occasions where they do come in handy, but the average Javascript
> programmer (which I'm assuming this is to be used for) probably isn't
> going to be using these too often.  Most of the time, regular expression
> objects are used to validate data in forms before submission.

But if you want conformance to ECMAScript, you don't care about the average
Javascript programmer but about the standard's requirements for conformance.
Of course, adding these to Boost and contributing the changes back is an
option.

YA

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