C# Regex to validate phone number

Question

It would be great if someone could help me with a Regex for phone numbers. Following are the conditions:

• If + is present, then it should be the first character

Answer 1

Not exactly the answer to your question, but for those who need to work with phone numbers, there is a .NET port of Google's libphonenumber: libphonenumber-csharp.

Answer 2

Try with:

^\+?(\d[\d-. ]+)?(\([\d-. ]+\))?[\d-. ]+\d$

However it does not handle number counting