From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2008-04-15T22:10:00+09:00
Subject: Re: Reg Exp

On Tue, Apr 15, 2008 at 2:59 PM, Dipesh Batheja
<dipesh_batheja@yahoo.com> wrote:
> Can somebody hep me with a very simple regular expression. I want to
>  write an regex which if matches a specific string should return false.
>  for example:
>  if i have string "Hello world", and i want to say, if you find "hello"
>  in this string then return false. Can someone explain how to write this?

Simple approach:

irb(main):007:0> a = "hello world"
=> "hello world"
irb(main):008:0> !(a =~ /hello/)
=> false
irb(main):009:0> !(a =~ /asdfsdf/)
=> true

Jesus.