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Newsgroups: comp.lang.ada
Date: Thu, 21 Mar 2019 09:17:08 -0700 (PDT)
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Subject: Re: Benchmarks Game - regex-redux - help needed
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Xref: reader01.eternal-september.org comp.lang.ada:55917
Date: 2019-03-21T09:17:08-07:00
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GNAT.Regexp is a very basic package that only handles a subset of regexps. =
It does so without backtracking, so it has a fairly predictable run time.

GNAT.Regpat is more capable (translated from an earlier version of the perl=
 regexp engine). It is however not as optimized or as extended as pcre is. =
The big lacking thing, to my mind, is support for unicode, in this day and =
age (wasn't an issue 17 years ago :-).

I always wanted to add a binding to pcre in either the GNAT runtime (likely=
 replacing GNAT.Regpat) or GNATCOLL. This should be fairly simple, as the A=
PI itself is fairly limited. That would give Ada much more powerful regexps=
, similar to what all other languages out there have.

Once thing that made it difficult in the beginning was building and packagi=
ng an extra external library, but I believe pcre is now a mandatory depende=
ncy for gcc anyway, so it is already distributed...

pcre is the de-facto standard for pcre nowadays. Maybe even Perl has now mo=
ved to it, though I am not sure. Every one else uses pcre.