CODEWITHSUNDEEP
regexasterisk
Aaron Ullal
Aaron Ullal

Reputation: 5235

Asterisk regular expression : Invalid preceding regular expression

I am trying to verify if inbound CLI matchest one of these patterns:

CLI STARTING WITH:

So i wrote the following

exten => s,n,Set(isita=${REGEX("^(+39|0039|3|0[1-9])" ${cli})})

However I am getting this error :

 Malformed input REGEX(): Invalid preceding regular expression

What is wrong with my regular expression?

Upvotes: 2

Views: 3422

Answers (2)

arheops
arheops

Reputation: 15257

Answer is correct, but use of REGEXP inside dialplan is not so nice idea. Dialplan itself is regexp, it have form for do regexp based on cli

exten => _s/_39.,n,Noop(do something for cli starting with 39)

So it more asterisk-way use dialplan, not regexp.

Upvotes: 0

Kaspar Lee
Kaspar Lee

Reputation: 5596

You need to escape the +, use this RegEx instead:

^(\\+39|0039|3|0[1-9])

You can see the error when you Test it on RegExr

Normally in a RegEx (in JavaScript for example, whre is it enclosed in /), you only need one \, however when the RegEx is stored in a string (in this case anyway), you need 2 \.

If you have one \, the string is trying to create a character based on \+ (like \n is a newline). You need the second \ to state that the first \ should not be converted.

New RegEx on RegExr

Upvotes: 4

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