Regular Expression Matching and Replace Outbound

When a user dials 933, we want to replace that as the call is sent out trunk. We are using the Identiy--> Called section and have followed the following article1, article2 and have tested our regex expression in regex101.
Thoughts on why this wouldn't be working?
Match Regular Express looks like this: ^(sip[s]?:|tel:)(+?)(933)
Format Regular Expression: We tried the following
${1}1${3}
${1}\x30${4}
$1\x30$4

The question is are we doing this the correct way? The two docs contradict each other in terms of how to format the outgoing change. What is the correct syntax?