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List:       kde-devel
Subject:    Re: Fwd: Regular expression library choices
From:       Rob Gillen <rgillen () webmd ! net>
Date:       2001-11-06 17:03:14
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Yep, I'd say you are correct on all accounts.  I cannot comment on point
three and whether Regex++ would add any additional functionality beyond
what PCRE would as I have not had time to evaluate the PCRE library.  My
goal (sort of) was to introduce the Boost library as an alternative, and
I was looking for some good arguments for or against it and not just a
rote dismissal.  The Boost libraries are technically very good, and are
developed by some pretty smart people out there.  However, as I
mentioned to the KFM-Devel mailing list (of which you should have been
CC'd) I did hear back from the author of the Regex++ library.  It turns
out that I was somewhat ignorant of the differences between Perl matches
versus POSIX matches.  Now that I've been schooled, I can say with a
pretty good degree of certainty that the Regex++ library isn't going to
offer the compatibility that will be required as per the ECMAScript-262
spec.

That said, I look forward to seeing RegExp objects in KJS. :)

Cheers,
Rob


Michael Bedy wrote:

 >   Hi,
 >
 >   Sorry, sent the previous reply to kfm-devel instead of kde-devel.
 >
 >   Anyway, I looked more closely at the documentation, and I see now that
 > it does have most of the Perl stuff. It just depends which options you
 > have selected. And it indeed does look like a nifty, full featured, C++
 > regular expression library.
 >
 >   But I can think of at least three reason why I think pcre is the better
 > choice, at least in the context of KJS:
 >
 >     1) It is simple. The interface to pcre is very easy to use.
 >        Maintence is really a non-issue. KJS is not doing anything
 >        remotely fancy enough to require the flexibility BOOST allows.
 >
 >     2) It is widely available. True, BOOST is available to download, but
 >        given that pcre seems to get installed on just about every Linux
 >        box by default now I would say libpcre is more readily available.
 >
 >     3) libpcre is already used by KJS (and has been for some time.) I'm
 >        just finishing the support.  In fact, it's working now on my
 >        machine. I'm just cleaning it up before I check it in. (Hopefully
 >        in a couple of days.) Switching to BOOST would be additional work
 >        for no functional gain as far as JavaScript regular 
expressions are
 >        concerned. (Correct me if I'm wrong.)
 >
 >   Don't get me wrong, I love whiz-bang C++ interfaces to things, and the
 > BOOST stuff looks cool. I just don't think using it is the best solution
 > in this case.


-- 
Rob Gillen
WebMD, Midtown-Atlanta


 
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