RegEx to allow Phone Numbers with #-###-###-#### or ###-###-#### format only

[Vipul Mehta]

Hi, I wanted a RegEx to allow user to enter phone number in #-###-###-#### or ###-###-#### format only. (Eg: 1-888-456-5678 or 888-456-5678) I have implemented RegEx[1] to allow user to enter Phone Number in #-###-###-#### format. What changes do we need to make to the existing RegEx so that it allows user to enter Phone Number in the above 2 formats only? Thanks in advance. [1] @"^\d{1}-\d{3}-\d{3}-\d{4}$" Regards, Vipul Mehta

Regards, Vipul Mehta

[Dinesh Mani]

You can just add an OR and put the 2nd type like so - "^\d{1}-\d{3}-\d{3}-\d{4}$|^\d{3}-\d{3}-\d{4}$" HTH!

[Vipul Mehta]

Thanks Dinesh!! This works well

Regards, Vipul Mehta

[Arindam Tewary]

Your regex should be like this

^(\d{1}-){0,1}\d{3}-\d{3}-\d{4}$

to allow it to capture mentioned two pattern and not any others. Please let me know if it helps you.

//String input = "888-456-5678";
String input = "1-888-456-5678";

        String sPattern = @"^(\\d{1}-){0,1}\\d{3}-\\d{3}-\\d{4}$";
        Regex o = new Regex(sPattern);
        Match m= o.Match(input);
        if (m.Success)
        {
            MessageBox.Show("Match found.");
        }
        else
        {
            MessageBox.Show("No match");
        }

Thanks, Arindam D Tewary