From: Robert Klemme <bob.news@...>
Date: 2004-10-22T17:19:14+09:00
Subject: Re: A little help on finding the closest match


"trans. (T. Onoma)" <transami@runbox.com> schrieb im Newsbeitrag
news:200410212302.34298.transami@runbox.com...
> On Thursday 21 October 2004 10:49 pm, trans.  (T. Onoma) wrote:
> | On Thursday 21 October 2004 10:21 pm, nobu.nokada@softhome.net wrote:
> | | Hi,
> | |
> | | At Fri, 22 Oct 2004 10:38:24 +0900,
> | |
> | | trans.  (T. Onoma) wrote in [ruby-talk:117331]:
> | | >   # example data
> | | >   str = "some string abc xyz"
> | | >   tokens = [ /abc/, /xyz/ ]
> | |
> | |     str.index(/#{tokens.join("|")}/)
>
> Actually, I'm still playing with it, but it looks like this won't work
b/c I
> have subexpressions in my actual tokens. e.g.
>
>   [ /()(abc)(\S)/, ... ]

If you're just interested in the tokens you probably want this:

/(token1)|(token2(?:sub2))/

i.e. use capturing groups for tokens and non capturing groups for all sub
groups.

> And the match indexes seem to get lost when I join them. Also, I'm not
sure
> how to tell which token it was that actually matched.

You can use Regexp#match. Or use scan in a method with return in the
block.

    robert