<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML//EN"> <html> <head> <title>MHonArc Resources: MSGEXCFILTER</title> </head> <body> <address> <a href="../resources.html#msgexcfilter">MHonArc Resource List</a><br> </address> <hr> <h1>MSGEXCFILTER</h1> <!-- *************************************************************** --> <hr> <h2>Syntax</h2> <dl> <dt><strong>Envariable</strong><dt> <dd><p> <code>M2H_MSGEXCFILTER=</code><var>Perl_expressions</var> </p> </dd> <dt><strong>Element</strong><dt> <dd><p><br> <code><MSGEXCFILTER></code><br> <var>Perl_expressions</var><br> <code></MSGEXCFILTER></code><br> </p> </dd> <dt><strong>Command-line Option</strong><dt> <dd><p><br> <code>-msgexcfilter </code><var>Perl_expressions</var> </p> </dd> </dl> <!-- *************************************************************** --> <hr> <h2>Description</h2> <p>MSGEXCFILTER may be used to define Perl expressions to selectively exclude messages during an <a href="add.html">ADD</a> operation. Unlike the <a href="checknoarchive.html">CHECKNOARCHIVE</a> resource, MSGEXCFILTER allows you to explicitly examine entire message headers to determine which messages should be added. </p> <p>When defining the expressions, the raw message header will be in the <b><tt>$_</tt></b> variable. If the last evaluated expression of MSGEXCFILTER returns a true value, or there is an explicit <tt>return</tt> statement that returns a true value, MHonArc will exclude the message. </p> <!-- *************************************************************** --> <hr> <h2>Default Setting</h2> <p>Nil. </p> <!-- *************************************************************** --> <hr> <h2>Resource Variables</h2> <p>N/A </p> <!-- *************************************************************** --> <hr> <h2>Examples</h2> <p>A typical usage of MSGEXCFILTER is to define a pattern match operation: </p> <pre> <b><MsgExcFilter></b> /^From: .*\behood@/im; <b></MsgExcFilter></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@ncsa.uiuc.edu</tt>: </p> <pre> <b><MsgExcFilter></b> !/\bmhonarc@ncsa.uiuc.edu\b/i; <b></MsgExcFilter></b> </pre> <p>Here, we do what the <a href="checknoarchive.html">CHECKNOARCHIVE</a> resource basically does: </p> <pre> <b><MsgExcFilter></b> /^restrict:\s+no-external-archive/im || /^x-no-archive:\s+yes/im; <b></MsgExcFilter></b> </pre> <!-- *************************************************************** --> <hr> <h2>Version</h2> <p>2.4.1 </p> <!-- *************************************************************** --> <hr> <h2>See Also</h2> <p> <a href="add.html">ADD</a>, <a href="checknoarchive.html">CHECKNOARCHIVE</a> </p> <!-- *************************************************************** --> <hr> <address> 00/10/28 11:13:04<br> <img align="top" src="../monicon.gif" alt=""> <a href="http://www.pobox.com/~ehood/mhonarc.html" ><strong>MHonArc</strong></a><br> Copyright © 1999, <a href="http://www.pobox.com/~ehood" >Earl Hood</a>, <a href="mailto:mhonarc@pobox.com" >mhonarc@pobox.com</a><br> </address> </body> </html>
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