From: Xavier Leroy <Xavier.Leroy@inria.fr>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Str, regular expressions, longest match
Date: Wed, 01 Oct 2014 18:28:16 +0200 [thread overview]
Message-ID: <542C2BA0.8020900@inria.fr> (raw)
In-Reply-To: <CABooLwNvJ_4frafqjjV0zpoDbduAV5MmVjdrNL=o3ibgMEVoLg@mail.gmail.com>
On 29/09/14 22:04, Tom Ridge wrote:
> I am trying to use the Str module to match regular expressions. I want to
> return the longest match.[...] I don't want the order of
> the alternatives to matter. What am I doing wrong?
Nothing: it's just that Str has first-match semantics, not longest-match.
> What can I do to match the longest substring?
In this particular example, you can sort the string patterns in
decreasing lexicographic order before putting them in ...|...|...
In more general case, you might have more luck with other regexp
libraries (e.g. PCRE or Vouillon's RE, but I didn't check whether they
implement longest match).
Hope this helps,
- Xavier Leroy
next prev parent reply other threads:[~2014-10-01 16:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-29 20:04 Tom Ridge
2014-09-30 12:47 ` Christophe Raffalli
2014-10-01 16:28 ` Xavier Leroy [this message]
2014-10-01 19:10 ` Tom Ridge
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