Validate digits script help

Asterisk Asterisk Support
1

Hi

I have written a custom dial plan for setting an immediate forward to give us more control and extra features however I am struggling to add in some validation checks.

In the early stages I found that people were forwarding to non-existant numbers. I therefore added a LEN line to check that they have entered a minimum of 4 digits. However the problem still remains of people entering nonexistent numbers.

My system is cross platform so ideally, all I am trying to do is have a validation check that checks to see that what they have entered starts with either a 4, 5, 7 or 9 and ideally is either 4 or 12 digits long (not less than 4 and not inbetween 4 and 12).

I’ve been struggling with this for a few weeks but not getting anywhere

Can anyone advise?

Thanks

2

You could do it with regular expressions, assuming that asterisk supports extended regular expressions, or you could use extension pattern matching, in a subroutine.

3

Going along the lines of checking whether it starts with 4, 5 or 7 I have tried this but it always returns 0

exten => s,n,GotoIf($[${REGEX(“4-7” ${toext:0:1})}]?externalcheck:intlengthchk)

I know 6 is covered in that but not sure how to just include 4, 5, 7

If I enter 5000 it returns 0 where I would have thought it would have returned a 1

4

Sussed, it

I was missing [] around the 4-7 (as well as still requiring “”)