Forex_Strategy_Builder.Calculator.SetPatterns C# (CSharp) Method

        void SetPatterns()
        {
            string patternNumber   = @"(?<numb>\-?\d+([\.,]\d+)?(E[\+\-]\d{1,2})?)";
            string patternOperator = @"(?<operator>[\+\-\*/\^])";
            string patternLast     = @"(?<last>[^\d\.,E])";

            string sOperation = string.Format(
                @"{0}\s*{1}\s*{2}\s*{3}",
                patternNumber.Replace("numb", "arg1"),
                patternOperator,
                patternNumber.Replace("numb", "arg2"),
                patternLast);

            expression = new Regex(sOperation, RegexOptions.Compiled);
        }