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Scripts: C# :: Form Validation :: Library Article #7

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Validating Phone Numbers using regular expressions in C#
By: Erobo Team Member

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In ths tutorial we explain how to validate an input field that requires phone numbers to be entered.

The function IsPhone takes as input an string that contains the phone number digits. Then, it creates a regular expression which tries to match common phone number patterns such as ### ### ####, ###-###-####, and (###) ###-###.
See the function below:

	Code Snippet 1

//Include Regular Expressions at the top of your script
using System.Text.RegularExpressions;

private bool IsPhone(String strPhone)
{
Regex objPhonePattern=new Regex(@"^[01]?[- .]?($[2-9]\d{2}$|[2-9]\d{2})[- .]?\d{3}[- .]?\d{4}$");
return objPhonePattern.IsMatch(strPhone);
}

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