What branch of (|) RE is match?

[S.Z.]

I have a fragment like this:

variant= [ /[abc]/, /[123]/, /[xyz]/ ];
re= /aaa\s(#{variant.join('|')})\sbbb/;
mch= 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= variant.find { |v| v.match(mch[1]); }

But it is superfluous work, isn't it?

 

[Jeff Wood]

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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.

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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