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<a name="GNU-Extensions"></a>
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<a name="GNU-Extensions-1"></a>
<h3 class="section">5.9 GNU Extensions</h3>

<p>This section summarizes the GNU extensions to the sieve language
</p>
<ol>
<li> Multiline strings syntax

<p>GNU libmu_sieve understands the following multiline string syntax:
</p>
<div class="smallexample">
<pre class="smallexample">text:[-][<var>delimiter</var>]
....
<var>delimiter</var>
</pre></div>

<p>The meaning of optional flags is the same as in shell &ldquo;here document&rdquo;
construct: the dash strips all leading tab characters from the string body,
thus allowing it to be indented in a natural fashion; <var>delimiter</var>
introduces the new end-of-text delimiter instead of the default
dot.  If <var>delimiter</var> starts with a backslash, no preprocessing will
be performed within a string.
</p>
</li><li> Handling of the <code>require</code> statement.

<ul>
<li> According to the RFC an error must occur if a <code>require</code> appears
after a command other than <code>require</code>.  The GNU sieve library allows
interspersing the <code>require</code> and other statements.  The only
requirement is that <code>require</code> must occur before a statement that is
using the required capability (see <a href="Require-Statement.html#Require-Statement">Require Statement</a>).

</li><li> Prefixing the required capability with &ldquo;test&rdquo; requires the use
of an extension test.
</li></ul>

</li><li> <code>header</code> test

<p>The <code>header</code> takes an optional argument <code>:mime</code>, meaning to
scan the headers from each part of a multipart message.
</p>
</li><li> <code>size</code> test

<p>The <code>size</code> test allows to omit the optional argument
(:over|:under).  In this case exact equality is assumed.
</p>
</li><li> <code>envelope</code> test

<p>The only value that can be meaningfully used as the first required
argument of an <code>envelope</code> test is &lsquo;<samp>from</samp>&rsquo;.  This limitation
may disappear from the subsequent releases.
</p>
</li><li> <code>fileinto</code> action

<p>The <code>fileinto</code> action allows to specify permissions on the mailbox,
in case it will be created (see <a href="Built_002din-Actions.html#fileinto">fileinto</a>).
</p>
</li><li> Match type optional argument.

<p>Along with the usual <code>:is</code>, <code>:matches</code> and <code>:contains</code>
matching type, GNU sieve library understands <code>:regex</code> type.  This
matching type toggles POSIX Extended Regular Expression matching.
</p></li></ol>


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