From: John Carter <john.carter@...>
Date: 2008-01-14T09:56:55+09:00
Subject: Re: regex help partial code

On Mon, 14 Jan 2008, Junkone wrote:

> irb(main):046:0> a=Regexp.new('(add)\s+(\S+)\s+([i|s|f])\s+([pei])?\s
> +',true)
> => /(add)\s+(\S+)\s+([i|s|f])\s+([pei])?\s+/i
> irb(main):047:0> a =~("Add comp i pe")
> => nil
>
> I dont get match at 4th token

irb
irb(main):002:0> /(add)\s+(\S+)\s+([i|s|f])\s+([pei])?\s+/i =~ "Add comp i pe"
=> nil
irb(main):003:0> /(add)\s+(\S+)\s+([i|s|f])\s+([pei])?/i =~ "Add comp i pe"
=> 0

The last \s+ insists on matching one or more whitespace chars.

Here is a general recipe for solving this class of problems....

Set up a simple test like I have above...

Delete elements out of the regex until it matches.

The problem was the last one you deleted.



John Carter                             Phone : (64)(3) 358 6639
Tait Electronics                        Fax   : (64)(3) 359 4632
PO Box 1645 Christchurch                Email : john.carter@tait.co.nz
New Zealand