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From: Richard Stallman <rms@gnu.org>
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Subject: Re: trivial bug of font-lock in Change Log mode.
Date: Fri, 27 May 2005 10:20:20 -0400
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    > 	  ;; Date lines, new and old styles.
    >     !     ("^\\([1-9][0-9][0-9][0-9]-[0-9-]+\\|\\(Sun\\|Mon\\|Tue\\|Wed\\|Thu\\|Fri\\|Sat\\|Sun\\) \\sw\\sw\\sw\\)[0-9:+ ]*"
    > 	   (0 'change-log-date-face)

    > Shouldn't that regexp end with + rather than *?

    The original regexp also ended with '*', and I don't know
    all the variations of date line.

It seems to me that it could not be a valid date
if that match is empty.  Don't you think so?