[Asterisk-Users] Alphanumeric pattern match in extensions.conf

[Dan Austin]

I need to match an incoming call based on a prefixed string, and this
solution was suggested to me some time back.

exten => _conf.,1,Answer
exten => _conf.,2,MeetMe(${EXTEN:4}|d)
exten => _conf.,3,Hangup

However incoming calls never match this pattern, and I cannot
find any evidence in the wiki or on google that such a pattern
is valid.  I'm currently running a SVN trunk, but have tested
with 1.0.X and 1.2.X.

Is anyone using alphanumeric patterns in their dialplan?

Dan