From: Simon Strandgaard <neoneye@...>
Date: 2004-11-12T16:19:29+09:00
Subject: Re: #scan with or'd (`|`) subexpressions.

On Friday 12 November 2004 03:55, trans.  (T. Onoma) wrote:
[snip]
> Well, I'm not sure how it helps. What I ended up doing was making sure all
> my expressions did have the _same number_ of sub-expressions (in this case
> 7). So then I could count the preceding nils and divide by 7 to find out
> which match. But that's a hack IMHO.
>
> Matz, yourself, and others past have all mentioned being able to figure out
> which match, but how?

I don't know if this helps..

bash-2.05b$ ruby a.rb
"lab0"          => [["0", nil, nil]]
"version1-beta" => [[nil, "1", nil]]
"go2ruby"       => [[nil, nil, "2"]]
"1 goto 1"      => [[nil, "1", nil], [nil, "1", nil]]
"2 1 0"         => [[nil, nil, "2"], [nil, "1", nil], ["0", nil, nil]]
bash-2.05b$ expand -t2 a.rb
def s(str)
  m = str.scan(/(0)|(1)|(2)/)
  puts "#{str.inspect.ljust(15)} => #{m.inspect}"
end
s "lab0"
s "version1-beta"
s "go2ruby"
s "1 goto 1"
s "2 1 0"
bash-2.05b$


--
Simon Strandgaard