From: Ken Bloom <kbloom@...>
Date: 2007-05-30T22:40:09+09:00
Subject: Re: Regexp to extract number with  hyphen

On Tue, 29 May 2007 15:45:34 -0700, bcparanj@gmail.com wrote:

> I have a text with "foo 01-02" in a string. I want to extract foo 01-02
> using regexp. reg = /foo (\d+)/ only extracts foo with numbers when
> there is no hyphen.
> 
> reg = /foo (\d{1,})|(\-)|(\d{1,})/   only extracts foo 01. TIA.

That's because the | operator in a regexp means either-or. So you're 
matching
  foo (\d{1,})
or you're matching
  (\-)
or you're matching
  (\d{1,})
but not all three at the same time.
Others have suggested the following correction:
  /(\d+)-?(\d+)/

--Ken


-- 
Ken Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/