C#交互窗口内使用：

 1. 是否为double

> using System.Text.RegularExpressions;> bool isMatch = Regex.IsMatch("652",@"^\d{6}$");> Console.Write(isMatch);False> bool isMatch = Regex.IsMatch("476800",@"^\d{6}$");> Console.Write(isMatch);TrueRegex RegNumber = new Regex("^[0-9]+(\\.[0-9]+)?$");  //  判断是否为double

 2. 判断 0-100 正整数

[TestMethod]        public void TestMethod1()        {            //   /^(0|[1-9]\d|100)$/            string regexString = "^(100|[1-9]\\d|\\d)$";            for (int i = 0; i < 100; i++)            {                Assert.AreEqual(true,Regex.IsMatch(i.ToString(),regexString));            }            Assert.AreEqual(false, Regex.IsMatch("-1", regexString));            Assert.AreEqual(false, Regex.IsMatch("-01", regexString));            Assert.AreEqual(false, Regex.IsMatch("-10", regexString));            Assert.AreEqual(false, Regex.IsMatch("-100", regexString));            Assert.AreEqual(false, Regex.IsMatch("101", regexString));            Assert.AreEqual(false, Regex.IsMatch("20.6", regexString));            Assert.AreEqual(false, Regex.IsMatch("99.99", regexString));            Assert.AreEqual(false, Regex.IsMatch("0.99", regexString));            Assert.AreEqual(false, Regex.IsMatch("1001", regexString));            Assert.AreEqual(false, Regex.IsMatch("10001", regexString));        }