一個可以匹配整數、浮點數的正則表達式

//正則表達式

string regStr =  "^[+-]?([0-9]*\.?[0-9]+|[0-9]+\.?[0-9]*)([eE][+-]?[0-9]+)?$";

Description	A regular expression that matches numbers. Integers or decimal numbers with or without the exponential form.
Matches	23 | -17.e23 | +.23e+2
Non-Matches	+.e2 | 23.17.5 | 10e2.0

 

 

 

 

 

驗證方法如下：

/// <summary>
        /// 驗證輸入字符串為數字
        /// </summary>
        /// <param name="str">輸入字符</param>
        /// <returns>返回一個bool類型的值</returns>
        private static bool IsNumeric(string str)
        {
            System.Text.RegularExpressions.Regex reg1
                = new System.Text.RegularExpressions.Regex(@"^[+-]?([0-9]*\.?[0-9]+|[0-9]+\.?[0-9]*)([eE][+-]?[0-9]+)?$");
            if (str != "")
            {
                return reg1.IsMatch(str);
            }
            else
            {
                return true;
            }
        }