o define a pattern match
operation:
</p>
<pre>
<b>&lt;MsgExcFilter&gt;</b>
/^From: .*\behood<!--
-->&#64;<!--
-->/im;
<b>&lt;/MsgExcFilter&gt;</b>
</pre>
<p>Here, we are excluding any messages that are from "ehood".  The
"<tt>m</tt>" modifier to the pattern match exists because the
header will contain newlines.
</p>

<p>The following example attempts to exclude all messages not addressed
to <tt>mhonarc-users<!--
-->&#64;<!--
-->mhonarc.org</tt>:
</p>
<pre>
<b>&lt;MsgExcFilter&gt;</b>
!/\bmhonarc-users<!--
-