Validate a specific country Carrier operator phone number regex c#

Question

I need to validate a phone number for a specific carrier operator using RegEx in C#, eg 94773650101 94 is the country code 77 is the carrier operator it can also be 76 how do I validate this using RegEx in C#. I need a format for it.

I've tried

var match = Regex.Match(mobileNo, @"\d947(\d7|6)\d{7}/");

Answer 1

All is very simple, try this: ^947[76]\\d{7}$

There is an errors in your regexp: \\d 947( \\d 7|6)\\d{7} /

I've mark it bold. You don't need to use \\d before 947 or 7|6 , \\d is any digit. And what for / at the end?

UPD for leading zeroes:

^(00)?947[76]\\d{7}$