<p>Adds flags for lookup() for filter contacts by user-agent with regexp.</p>

<hr>

<h4>You can merge this Pull Request by running</h4>
<pre>  git pull https://github.com/nikbyte/opensips master</pre>
<p>Or view, comment on, or merge it at:</p>
<p>&nbsp;&nbsp;<a href='https://github.com/OpenSIPS/opensips/pull/223'>https://github.com/OpenSIPS/opensips/pull/223</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>registrar module: user-agent filtering for lookup()</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/OpenSIPS/opensips/pull/223/files#diff-0">modules/registrar/README</a>
    (10)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/OpenSIPS/opensips/pull/223/files#diff-1">modules/registrar/doc/registrar_admin.xml</a>
    (22)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/OpenSIPS/opensips/pull/223/files#diff-2">modules/registrar/lookup.c</a>
    (58)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/OpenSIPS/opensips/pull/223/files#diff-3">modules/registrar/reg_mod.h</a>
    (1)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/OpenSIPS/opensips/pull/223.patch'>https://github.com/OpenSIPS/opensips/pull/223.patch</a></li>
  <li><a href='https://github.com/OpenSIPS/opensips/pull/223.diff'>https://github.com/OpenSIPS/opensips/pull/223.diff</a></li>
</ul>

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