From: Jeff Wood <jeff.darklight@...>
Date: 2005-11-26T22:23:06+09:00
Subject: Re: What branch of (|) RE is match?

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If you put each of the variants into seperate groups, you can check nil on
groups and will know exactly which matched.

a =3D "hello world"
b =3D /(ell)|(goo)/
c =3D b.match a
c.to_a # first element is match, second the match on the group (ell), third
the match on (goo)

should be what you're after.

j.

On 11/26/05, S.Z. <zbl@operamail.com> wrote:
>
> I have a fragment like this:
>
> variant=3D [ /[abc]/, /[123]/, /[xyz]/ ];
> re=3D /aaa\s(#{variant.join('|')})\sbbb/;
> mch=3D re.match($stdin.read);
>
> (Remove the semicolons if you hate them.)
>
> Now, I need to know what branch of variant is match, /[abc]/ or /[123]/
> or /[xyz]/
> How can I reveal it?
>
> variant can be iterated with mch[1] :
>
> vm=3D variant.find { |v| v.match(mch[1]); }
>
> But it is superfluous work, isn't it?
>
>
>


--
"Remember. Understand. Believe. Yield! -> http://ruby-lang.org"

Jeff Wood

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