From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-01-11T21:55:26+09:00
Subject: Re: Regex help

On Mon, Jan 11, 2010 at 1:39 PM, Chris Lervag <chris.lervag@gmail.com> wrote:
> Hi
> I want to test a string for three properties:
> 1) It is exactly 9 characters long.
> 2) Character number 5 is a comma (',').
> 3) The other characters are either numbers 0-9 or letters a-f.
>
> I have been able to do this by a combination of strings methods for 1)
> and 2), and using a regex match on the string (stripped of the comma)
> with the following code:
> myString =~ /([^a-f0-9])/
>
> If possible I would like to simplify this by using a more advanced regex
> match to check all three properties at one time. If this is possible,
> perhaps one of you regex wizards out there could show me how? :)

irb(main):006:0> re = /\A[a-f0-9]{4},[a-f0-9]{4}\z/
=> /\A[a-f0-9]{4},[a-f0-9]{4}\z/
irb(main):007:0> "abcd,4f2ddf" =~ re
=> nil
irb(main):008:0> "abcd,4f32" =~ re
=> 0

Hope this helps,

Jesus.