[Freeswitch-users] empty var expression

[Madovsky]

I tried this for an var marked as "UNDEF" in log

<condition field="${var}" expression="^UNDEF$" break="never">
<condition field="${var}" expression="UNDEF" break="never">
<condition field="${var}" expression="undef" break="never">
<condition field="${var}" expression="^undef$" break="never">
<condition field="${var}" expression="" break="never">
<condition field="${var}" expression="^$" break="never">
<condition field="${var}" expression="[UNDEF]" break="never">
<condition field="${var}" expression="[]" break="never">

without success.
which is the right expression for empty var please ?

Thanks



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