I thought it was __undef__, ain&#39;t it? I haven&#39;t digged into the source code, but should be easy enough to give it a try...<div><br></div><div>Regards,<br clear="all">Joćo Mesquita<br>
<br><br><div class="gmail_quote">On Fri, Jan 14, 2011 at 5:22 PM, Madovsky <span dir="ltr">&lt;<a href="mailto:infos@madovsky.org">infos@madovsky.org</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">






<div bgcolor="#ffffff">
<div><font size="2">I tried this for an var marked as &quot;UNDEF&quot; in log</font></div>
<div><font size="2"></font> </div>
<div><font size="2">&lt;condition field=&quot;${var}&quot; expression=&quot;^UNDEF$&quot; 
break=&quot;never&quot;&gt;</font></div>
<div><font size="2">&lt;condition field=&quot;${var}&quot; expression=&quot;UNDEF&quot; 
break=&quot;never&quot;&gt;</font></div>
<div><font size="2">&lt;condition field=&quot;${var}&quot; expression=&quot;undef&quot; 
break=&quot;never&quot;&gt;</font></div>
<div><font size="2">&lt;condition field=&quot;${var}&quot; expression=&quot;^undef$&quot; 
break=&quot;never&quot;&gt;</font></div>
<div><font size="2">&lt;condition field=&quot;${var}&quot; expression=&quot;&quot; 
break=&quot;never&quot;&gt;</font></div>
<div><font size="2">&lt;condition field=&quot;${var}&quot; expression=&quot;^$&quot; 
break=&quot;never&quot;&gt;</font></div>
<div><font size="2">&lt;condition field=&quot;${var}&quot; expression=&quot;[UNDEF]&quot; 
break=&quot;never&quot;&gt;</font></div>
<div><font size="2">&lt;condition field=&quot;${var}&quot; expression=&quot;[]&quot; 
break=&quot;never&quot;&gt;</font></div>
<div><font size="2"></font> </div>
<div><font size="2">without success.</font></div>
<div><font size="2">which is the right expression for empty var please 
?</font></div>
<div><font size="2"></font> </div>
<div><font size="2">Thanks</font></div>
<div><br></div>
<div><font size="2"></font> </div>
<div><font size="2"></font> </div></div>
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<br></blockquote></div><br></div>