Regex to match all us phone number formats

Question

First of all i would say i have seen many example here and googled but none found that matches all the condition i am looking for some match top 3 not below some inbetween.

Answer 1

 public bool IsValidPhone(string Phone)
    {
        try
        {
            if (string.IsNullOrEmpty(Phone))
                return false;
            var r = new Regex(@"^\(?([0-9]{3})\)?[-.●]?([0-9]{3})[-.●]?([0-9]{4})$");
            return r.IsMatch(Phone);

        }
        catch (Exception)
        {
            throw;
        }
    }

Answer 2

To extend upon FlyingStreudel's correct answer, I modified it to accept '.' as a delimiter, which was a requirement for me.

\(?\d{3}\)?[-\.]? *\d{3}[-\.]? *[-\.]?\d{4}

in use (finding all phone numbers in a string):

string text = "...the text to search...";
string pattern = @"\(?\d{3}\)?[-\.]? *\d{3}[-\.]? *[-\.]?\d{4}";
Regex regex = new Regex(pattern, RegexOptions.IgnoreCase);
Match match = regex.Match(text);
while (match.Success)
{
    string phoneNumber = match.Groups[0].Value;
    //TODO do something with the phone number
    match = match.NextMatch();
}

Answer 3

for c#, the for US phone number validation should be like below

^\(?\d{3}?\)??-??\(?\d{3}?\)??-??\(?\d{4}?\)??-?$

777-777-7777

Answer 4

^?\(?\d{3}?\)??-??\(?\d{3}?\)??-??\(?\d{4}?\)??-?$

This allows:

• (123)-456-7890
• 123-456-7890

Answer 5

\(?\d{3}\)?-? *\d{3}-? *-?\d{4}

Answer 6

Help yourself. Dont use a regex for this. Google release a great library to handle this specific use case: libphonenumber. There is an online demo of the lib.

public static void Main()
{
    var phoneUtil = PhoneNumberUtil.GetInstance();
    var numberProto = phoneUtil.Parse("(979) 778-0978", "US");
    var formattedPhone = phoneUtil.Format(numberProto, PhoneNumberFormat.INTERNATIONAL);
    Console.WriteLine(formattedPhone);
}

Demo on .NETFiddle