Some regex expressions not working in certain search tools

I have been experimenting with regular expressions in the
"search"
dialogs of two different text editors/search utilities that
supposedly
support regular expressions (Visual Studio 2005 and GREP for
windows),
and I cannot get either of them to recognize certain
expressions.

Here is an example:

I cannot get either application (GREP or VS2005) to
recognize the
following expression:
     \d

Although both tools will recognize :
   [0-9][0-9][0-9][0-9]

Backreferences are not working either.
I'm trying to indicate a backreference (to reference the
first group in
a regex) as follows:
     \1

Are these limitations of the tools I'm using, or is there
some special
syntax that these tools require?

Can someone shed some light on the situation?

Thanks,
Jonathan


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the regex I sent u in the prev thread was actually tested OK
in VStudio
(using backreference)

shoe your code in VStudio, is it C# (I hope)?

Sergei


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