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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><title>nomatch mode - property replacer - rsyslog.conf</title></head> <body> <h1>nomatch mode - property replacer - rsyslog.con</h1> <p>This is a part of the <a href="rsyslog_conf.html">rsyslog.conf documentation</a> of the <a href="property_replacer.html">property replacer</a>.</p> <p><b>The "nomatch-Mode" specifies which string the property replacer shall return if a regular expression did not find the search string.</b>. Traditionally, the string "**NO MATCH**" was returned, but many people complained this was almost never useful. Still, this mode is support as "<b>DFLT</b>" for legacy configurations. <p>Three additional and potentially useful modes exist: in one (<b>BLANK</b>) a blank string is returned. This is probably useful for inserting values into databases where no value shall be inserted if the expression could not be found. <p>A similar mode is "<b>ZERO</b>" where the string "0" is returned. This is suitable for numerical values. A use case may be that you record a traffic log based on firewall rules and the "bytes transmitted" counter is extracted via a regular expression. If no "bytes transmitted" counter is available in the current message, it is probably a good idea to return an empty string, which the database layer can turn into a zero. <p>The other mode is "<b>FIELD</b>", in which the complete field is returned. This may be useful in cases where absense of a match is considered a failure and the message that triggered it shall be logged. <p>If in doubt, <b>it is highly suggested to use the <a href="http://www.rsyslog.com/tool-regex">rsyslog online regular expression checker and generator</a> to see these options in action</b>. With that online tool, you can craft regular expressions based on samples and try out the different modes. <h2>Summary of nomatch Modes</h2> <table border="1" cellspacing="0"> <tr><td><b>Mode</b></td><td><b>Returned</b></td></tr> <tr><td>DFLT</td><td>"**NO MATCH**"</td></tr> <tr><td>BLANK</td><td>"" (empty string)</td></tr> <tr><td>ZERO</td><td>"0"</td></tr> <tr><td>FIELD</td><td>full content of original field</td></tr> <tr><td> </td><td><a href="http://www.rsyslog.com/tool-regex">Interactive Tool</a></td></tr> </table> <p>[<a href="manual.html">manual index</a>] [<a href="rsyslog_conf.html">rsyslog.conf</a>] [<a href="http://www.rsyslog.com/">rsyslog site</a>]</p> <p><font size="2">This documentation is part of the <a href="http://www.rsyslog.com/">rsyslog</a> project.<br> Copyright © 2008 by <a href="http://www.gerhards.net/rainer">Rainer Gerhards</a> and <a href="http://www.adiscon.com/">Adiscon</a>. Released under the GNU GPL version 2 or higher.</font></p> </body> </html>
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