AK.ValidityChecker.IsValidNameOrConstant C# (CSharp) Method

        public static bool IsValidNameOrConstant(string s)
        {
            string[] mustMatchWith = {
                @"^[a-zA-Z_][a-zA-Z_0-9]*$" /* a constant, function name - can not start with a number */,
                @"^[0-9]*$",
                @"^[0-9]+.[0-9]*$",
                @"^[0-9]*.[0-9]+$",
            };
            for (int j=0;j<mustMatchWith.Length;j++)
            {
                if (Regex.IsMatch(s,mustMatchWith[j]))
                {
                    return true;
                }
            }
            return false;
        }