Validates the phone number with regular expression

   

//Microsoft Public License (Ms-PL)
//http://c4fdevkit.codeplex.com/license

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace C4F.DevKit.WebServices
{
    /// <summary>
    /// Provides useful methods like conversion methods.
    /// </summary>
    public static class Utility
    {
        /// <summary>
        /// Validates the phone number 
        /// [Example formats: '212-123-4567', '(212)123-4567', '2121234567', '(212) 123-4567', '(212)-123-4567']
        /// </summary>
        /// <param name="phoneNumber">Phone number</param>
        /// <returns>True if phone number is valid</returns>
        public static bool ValidatePhoneNumber(string phoneNumber)
        {
            if (String.IsNullOrEmpty(phoneNumber))
                return false;

            return Regex.IsMatch(phoneNumber, "^[(]?[2-9][0-9]{2}[)]?[ -]?[0-9]{3}[ -]?[0-9]{4}$");
        }
       
    }
}

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Validates the phone number with regular expression : Match « Regular Expressions « C# / C Sharp

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