正则表达式的运用C#

左手的ㄟ右手 2023-01-07 02:29 199阅读 0赞

#region 正则表达式
                string print = "344545fdfd";
                string pattern = @"^\d*$";//使输入的全是数字
                bool flag = Regex.IsMatch(print,pattern);
                Console.WriteLine(flag);
    
                string str1 = "I am a o Cat";
                string pateern1 = @"[^ahou]"; //除了里面的字符，其他被替换。
                string s = Regex.Replace(str1,pateern1,"*");
                Console.WriteLine(s);
    
                //重复描述字符
                string qq1 = "22566565";
                string qq2 = "3235";
                string qq3 = "455823365446587374";
                string pateern2 = @"^\d{5,12}$";
                Console.WriteLine(Regex.IsMatch(qq1, pateern2));
                Console.WriteLine(Regex.IsMatch(qq2, pateern2));
                Console.WriteLine(Regex.IsMatch(qq3, pateern2));
    
                //择一匹配
                string str2= "534232HHHdss@()8飒飒多多所多色无个";
                string pateern3 = @"\d|[a-z]";//选择数字或a-z的数字。
                MatchCollection col = Regex.Matches(str2, pateern3);
                var strs = "";
                foreach (Match item in col)
                { 
                    strs += item.ToString();
                    Console.WriteLine(item.ToString());
                }
                Console.WriteLine(strs);
    
                string str3 = "zhangsan,lisi;wangwu.wanger=mazi";
                // string pateern4 = @"[;,.=]";
                string pateern4 = @"[;]|[,]|[.]|[=]";//择一匹配分割字符，选出姓名
                string[] resArray = Regex.Split(str3, pateern4);
                foreach (var item in resArray)
                { 
                    Console.WriteLine(item);
                }
    
                //对表达式进行分组
                //重复多个字符 使用（abcd）{n}进行分组限定
                string inputstr = Console.ReadLine();
                string strGroups = @"(ab\w{2}){2}";//等价于“ad\w{2}ad\w{2}”
                Console.WriteLine("分组字符重复两次替换为5555，结果为："+Regex.Replace(inputstr,strGroups,"5555"));
                #endregion

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