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
• Allowed characters are numbers ( ) space - and .
• Minimum of 6 numbers and max 12
• ( , ) and space can come anywhere in the string
• - shouldn't be the first and last character and shouldn't appear immediately after +, if + is present.

Here are some valid numbers:

• +93483227359
• +1 703 335 65123
• 34565464
• 001 (703) 332-6261
• +1703.338.6512
• +934-83227359
• (111)123-4567
• 111-123-4567

Thanks in advance

Answer 1

Try with:

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

However it does not handle number counting

Answer 2

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.