numeric validation allowed 2 digit after decimal

var RegularExpression  =  new RegExp(^\d+(\.\d{1,2})?$);
if (RegularExpression.match("your_number_string"))
{
 alert("Valid Number");
} else
{
  alert("INVALID Number");
}

public static bool IsDesimal(string strValue)
        {
            string decimalNumber = ".0123456789";
            for (int i = 0; i < strValue.Trim().Length; i++)
            {
                if (decimalNumber.IndexOf(strValue[i]) == -1)
                {
                    return false;
                }
            }

            return true;
        }

        /// <summary>
        /// Returns the Validate Input Numeric Value
        /// </summary>
        /// <param name="strValue"></param>
        /// <returns>Numeric Value</returns>
        public static bool IsNumeric(string strValue)
        {
            string decimalNumber = "0123456789";
            for (int i = 0; i < strValue.Trim().Length; i++)
            {
                if (decimalNumber.IndexOf(strValue[i]) == -1)
                {
                    return false;
                }
            }

            return true;
        }