Regular expression to get country code out of a complete phone number

[baljit55]

My phone numbers are in +1-123-456-7890 format and I need to attribute map it to the country code only.

Example:

Input : +1-123-456-7890 Output : 1

Input : +44-123-456-7890 Output : 44

I am using expression as below but it is not working.

'Replace([telephoneNumber], , "\\+(?<isdCode>\\d*)(?<phoneNumber>\\d{10})", , "${isdCode}", , )'

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