From: Relm <relm@3tlk.net>
Date: 2006-09-30T15:55:23+09:00
Subject: Re: Regexp help

On Fri, 29 Sep 2006, Vincent Fourmond wrote:

>   Hello
> 
> > I have a string of the form
> > 
> > 2h 3m
> > 
> > or
> > 
> > 3m 2h
> > [....]
> > Is there a smart regexp one liner that could produce
> > 
> > [2, 3]
> 
>   If you want to get [2,3] in both cases, that will be really difficult.
> As far as I know, you can only do that in C#, which has named capturing
> groups. In all the other languages I know, the capturing groups are
> numbered when they are found... That rules it out.

irb> a
=> ["2h 3m", "3m 2h", "2h 3minutes", "2hour 3min", "2"]
irb> re
=> /(?=.*\b(\d+)(?=h|\b))(?=.*\b(\d+)m|)/
irb> a.map {|x| x.match(re).captures}
=> [["2", "3"], ["2", "3"], ["2", "3"], ["2", "3"], ["2", nil]]

-- 
Relm