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how to write filter regexp?

From: Tom Roche
Subject: how to write filter regexp?
Date: Tue, 25 Jun 2002 13:17:16 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.0) Gecko/20020530

How does one negate an entire regexp (not merely a character range)?
Why I ask:

I'd like to use ediff-directories to compare two directories that
contain (mostly) java file, and I'd like to compare _only_ the java

C-h f ediff-directories
> (ediff-directories DIR1 DIR2 REGEXP)

> Run Ediff on a pair of directories, DIR1 and DIR2, comparing files
> that have the same name in both. The third argument, REGEXP, is a
> regular expression that can be used to filter out certain file
> names.

What would be the appropriate filter regexp, given that I want the
_complement_ of *.java?

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