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query replace regex


From: Gary Wessle
Subject: query replace regex
Date: 22 Feb 2007 05:58:41 +1100
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.4

Hi
I need to replace 
452452451 1.4445 1.4254
with
452452451 1 1

so I started by search regex to find if I can get the regex correct.
^\\d* \\d\\.\\d* \\d\\.\\d*$
is reporting fail as soon as I type the second "\" in the line.

how can I do this task?

many thanks


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