regex - how to get the syntax correct

[dv8inpp]

I am trying to build a regex for my outbound numbers. Currently I have this ^((?:096)\d{7})$ which works for 096x xxx xxx

What I would like to have is it with or without country code ^(?:+855|855)((096)\d{7})$ I have tried this but no luck. I've been to https://regexr.com/ but still not understanding regex

What is the obvious mistake? How do I account for

 

[fusionpbxnoaudio]

<condition field="destination_number" expression="^(?:\+?countrycode)?(\d{10})$">

 

[Adrian Fretwell]

The answer above looks good to me.

Another pretty good tester site is https://regex101.com/ if you want to experiment.

You may also find this post informative:
https://www.pbxforums.com/threads/regex-for-one-single-outbound-route-uk.3819/

 

[Architect]

I use this link to do tests on my regex... http://regexstorm.net/tester

The Table tab at the bottom shows you what your input gets replaced with to confirm you're passing what you expected to pass to the gateway.