一个可以匹配整数、浮点数的正则表达式

//正则表达式

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

验证方法如下：

View Code

 1 /// <summary>
 2         /// 验证输入字符串为数字
 3         /// </summary>
 4         /// <param name="str">输入字符</param>
 5         /// <returns>返回一个bool类型的值</returns>
 6         private static bool IsNumeric(string str)
 7         {
 8             System.Text.RegularExpressions.Regex reg1
 9                 = new System.Text.RegularExpressions.Regex(@"^[+-]?([0-9]*\.?[0-9]+|[0-9]+\.?[0-9]*)([eE][+-]?[0-9]+)?$");
10             if (str != "")
11             {
12                 return reg1.IsMatch(str);
13             }
14             else
15             {
16                 return true;
17             }
18         }