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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: re-builder.el
Date: Fri, 09 Mar 2007 16:26:02 -0500
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In-reply-to: <m2odn2twbm.fsf@sowhat.denx.de> (message from Detlev Zundel on
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Xref: news.gmane.org gmane.emacs.devel:67650
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I presume you got the subsequent message with the details of the bug.

Someone wrote

    It's because re-builder declares as "invalid" any regexp that matches the
    empty string.

So I suggested:

    Is there a way it could visibly but not annoyingly notify the user
    about this, instead of rejecting such a regexp?