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Regex IsMatch Method (String, String, RegexOptions)

using System; using System.Text.RegularExpressions; public class Example {    public static void Main()    {       string[] partNumbers= { "1111-111-1111" };       string pattern = @"^[A-Z0-9]\d{2}[A-Z0-9](-\d{3}){2}[A-Z0-9]$";       foreach (string partNumber in partNumbers)          Console.WriteLine(Regex.IsMatch(partNumber, pattern, RegexOptions.IgnoreCase));    } }