[Asterisk-Users] extensions and regular expressions ( probably an easy question )

[Sean Kennedy]

Hi Dan,

Thanks for the info, but what I'm after is the ability to match a 
digit/character 0 or 1 times at the beginning of the string.  If I'm 
reading your example right, it'll match anything starting with 866, 
which doesn't work for me.  I am trying to match:

18661234567 and 8661234567

Sean

ps:  The pdf doesn't have a good explaination of this either, although 
it occurs to me that this might not be possible with * if I'm having 
such a hard time finding it.
Daniel Wright wrote:

> Sean Kennedy wrote:
>
>> Hi all,
>>
>> I'm having a hard time finding information related to the regular 
>> expressions that can be used in a dialplan, specifically as an 
>> extension.  For example, I have an 800 number which I'd like to jump 
>> directly to if my users dial it, instead of going over my pstn 
>> termination.  Currently, it looks like this:
>>
>> exten => 8661234567,1,Goto(800-in)
>>
>> However, I'd like 1866123456 to match as well.  I can't find in the 
>> wiki or sample configs how to say "match this 0 or 1 times".
>> Can anybody provide a link that would go over this?  Again, I've been 
>> digging through the wiki, but I seem to be missing it.
>>
>> Thanks
>>
>> Sean
>>
> You could do it like this:
>
> exten => _866.,1,GoTo(800-in)
>
> The period means match one or more characters.
>
> You can find reference to expressions and how they work  in this pdf 
> book http://www.nufone.net/downloads/asteriskdocs/AsteriskTFOT.zip
>
> Dan