using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(VerifyRegEx("^[A-Z").ToString());

    }

​

​

    public static bool VerifyRegEx(string testPattern)

    {

        bool isValid = true;

​

        if ((testPattern != null) && (testPattern.Trim( ).Length > 0))

        {

            try

            {

                Regex.Match("", testPattern);

            }

            catch (ArgumentException)

            {

                // BAD PATTERN: Syntax error

                isValid = false;

            }

        }

        else

        {

            //BAD PATTERN: Pattern is null or blank

            isValid = false;

        }

​

        return (isValid);

    }

}