From: "Iñaki Baz Castillo" <ibc@...>
Date: 2009-01-29T08:57:54+09:00
Subject: Re: error with regular expression inside eval block

El Jueves, 29 de Enero de 2009, Barun Singh escribió:
> I'm seeing strange behavior with Ruby 1.8 when I try to evaluate a
> regular expression inside an eval block.
>
> Consider the following:
>
> puts '1' =~ /^[\d]+$/
>
>  >> outputs "0" to the terminal
>
> eval %Q{'1' =~ /^[\d]+$/}
>
>  >> outputs "nil" to the screen
>
> Could someone explain why the eval statement returns an incorrect result
> for the regexp match?  Thanks...

It works if you escape the \ with \\ :

  eval %Q{'1' =~ /^[\\d]+$/}
  => 0

Not sure why the \ must be escaped into a block code.

-- 
Iñaki Baz Castillo