Escaping exclamation, greater than, less than inside of a recipe

I searched the archives to see if it was necessary to escape an (!)
exclamtion point inside of a receipe.

When I searched "escape exclamation", I read David Tamkin's answer here:
http://www.xray.mpe.mpg.de/mailing-lists/procmail/2003-01/msg00466.html

And I know that escaping the less than (or greater than) sign means start
(or end) of a word.

So when I entered this recipe:

     # Catch false HTML comments
     :0 B:
     * <!....>
     .SPAM/false_HTML_comments


My logs spewed the following:


procmail: Skipped "!....>"
procmail: No match on "<!....>"


Im curious as to why.

Thanks
Birl



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