GROUP_MATCH_COUNT(pattern[@category])

Returns the number of channels in groups matching the specified pattern.

; Query for the number of channels in groups group[1-4]:
exten => 123,1,Set(foo=${GROUP_MATCH_COUNT(group[1-4])})

  -= Info about function 'GROUP_MATCH_COUNT' =- 

[Syntax]
GROUP_MATCH_COUNT(groupmatch[@category])

[Synopsis]
Counts the number of channels in the groups matching the specified pattern

[Description]
Calculates the group count for all groups that match the specified pattern.
Uses standard regular expression matching (see regex(7)).

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