From: Navindra Umanee <navindra@...>
Date: 2005-01-30T01:15:53+09:00
Subject: Re: string extraction

Martin S. Weber <Ephaeton@gmx.net> wrote:
> string[%r|/(\d+)/+$|, 1] ?

Exactly what I was looking for, thanks.  The zero-width positive
lookahead is also interesting.

str[regexp, fixnum]

Is there a similar way to combine and use different matched groups
instead of being restricted to a fixnum?  Say instead of just \1 you
had a match for \1 and \2 and you wanted the output string to be \2 \1

"byru"[/(by)(ru)/, \2\1]

should output "ruby".

Thanks,
Navin.