From: Jeff Schoolcraft <jeffrey.schoolcraft@...>
Date: 2008-04-15T22:42:24+09:00
Subject: Re: Reg Exp

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I don't think you'll be able to do what you want with just a regex pattern.
The closest you could get is negative lookahead.  You'd have to pull out th=
e
first character and use negative lookahead for the rest, it will probably
only work for simple strings.

irb(main):029:0> a =3D "Hello World"
=3D> "Hello World"
irb(main):030:0> a =3D~ /h(?!ello)/i
=3D> nil
irb(main):031:0> b =3D "Hel l o world"
=3D> "Hel l o world"
irb(main):032:0> b =3D~ /h(?!ello)/i
=3D> 0


On Tue, Apr 15, 2008 at 9:17 AM, Dipesh Batheja <dipesh_batheja@yahoo.com>
wrote:

> Problem is i have function, which takes a regex as the parameter. I want
> to pass this regex in such a way that the function returns false if the
> string is matched and true if it isn't. I want the regex itself specify
> that if it matches the given string then it is false otherwise true.
>
> Jes=FAs Gabriel y Gal=E1n wrote:
> > 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 =3D "hello world"
> > =3D> "hello world"
> > irb(main):008:0> !(a =3D~ /hello/)
> > =3D> false
> > irb(main):009:0> !(a =3D~ /asdfsdf/)
> > =3D> true
> >
> > Jesus.
>
> --
> Posted via http://www.ruby-forum.com/.
>
>


--=20
Jeff Schoolcraft
http://thequeue.net/blog/
Microsoft MVP

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