1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Net; 5 using System.Text; 6 using System.Text.RegularExpressions; 7 using System.Threading.Tasks; 8  9 namespace ConsoleApplication710 {11     class Program12     {13         static void Main(string[] args)14         {15                                      //一个字符.除了回车，其他的都符合16             string regularExpression = ".";17             Regex rg = new Regex(regularExpression);18 19             string contents = "0123456789abcdefg";20             for (int i = 0; i < contents.Length; i++)21             {22                 if(rg.IsMatch(contents[i].ToString()))23                 {24                     Console.WriteLine(contents[i]+"符合正则表达式");25                 }26                 else27                 {28                     Console.WriteLine(contents[i] + "不符合正则表达式");29 30                 }31             }32 33             string test = "\n";34             if (rg.IsMatch(test))35             {36                 Console.WriteLine( "回车符合正则表达式");37             }38             else39             {40                 Console.WriteLine( "回车不符合正则表达式");41 42             }43 44             Console.ReadKey();45         }46     }47 }