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<h2><a href="https://wiki.asterisk.org/wiki/display/AST/Asterisk+10+Function_FILTER">Asterisk 10 Function_FILTER</a></h2>
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<h1><a name="Asterisk10Function_FILTER-FILTER%28%29"></a>FILTER()</h1>
<h3><a name="Asterisk10Function_FILTER-Synopsis"></a>Synopsis</h3>
<p>Filter the string to include only the allowed characters</p>
<h3><a name="Asterisk10Function_FILTER-Description"></a>Description</h3>
<p>Permits all characters listed in <em>allowed-chars</em>, filtering all others outs. In addition to literally listing the characters, you may also use ranges of characters (delimited by a <tt>-</tt> </p>
<p>Hexadecimal characters started with a <tt>\x</tt> (i.e. \x20) </p>
<p>Octal characters started with a <tt>\0</tt> (i.e. \040) </p>
<p>Also <tt>\t</tt>, <tt>\n</tt> and <tt>\r</tt> are recognized. </p>
<p>If you want the If you want the <tt>-</tt> character it needs to be prefixed with a {{}}</p>
<h3><a name="Asterisk10Function_FILTER-Syntax"></a>Syntax</h3>
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<pre>FILTER(allowed-chars,string)</pre>
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<h5><a name="Asterisk10Function_FILTER-Arguments"></a>Arguments</h5>
<ul>
<li><tt>allowed-chars</tt></li>
<li><tt>string</tt></li>
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<h3><a name="Asterisk10Function_FILTER-SeeAlso"></a>See Also</h3>
<h3><a name="Asterisk10Function_FILTER-ImportVersion"></a>Import Version</h3>
<p>This documentation was imported from Asterisk version SVN-branch-10-r340810.</p>
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