学步园

            //①正则表达式 = > 匹配字符串
            string Text = @"This is a book , this is my book , Is not IIS";

            //定义一个模式字符串,不仅仅是纯文本，还可以是正则表达式
            string Pattern = "is";

            MatchCollection Matches = Regex.Matches(
                Text,
                Pattern,
                RegexOptions.IgnoreCase |         //忽略大小写
                RegexOptions.ExplicitCapture |    //提高检索效率
                RegexOptions.RightToLeft          //从左向右匹配字符串
                );

            Console.WriteLine("从右向左匹配字符串：");

            foreach (Match NextMatch in Matches)
            {               
                Console.Write("匹配的位置：{0,2} ", NextMatch.Index);
                Console.Write("匹配的内容：{0,2} ", NextMatch.Value);
                Console.Write("/n");   
            }

            Console.WriteLine();

            //②匹配以大写I开头
            //“/b”是转义序列，代表开头和结尾(一个字的边界，忽略空白或标点)
            Pattern = @"/bI";
            Matches = Regex.Matches(
                Text,
                Pattern,
                RegexOptions.ExplicitCapture    //提高检索效率
                );

            Console.WriteLine("从左向右匹配字符串：");

            foreach (Match NextMatch in Matches)
            {
                Console.Write("匹配的位置：{0} ", NextMatch.Index);
                Console.Write("匹配的内容：{0} ", NextMatch.Value);
                Console.Write("/n");
            }

            Console.WriteLine();

            //③匹配以大写I开头，大写S结尾的字符串
            //“/b”是转义序列，代表开头和结尾(一个字的边界，忽略空白或标点)
            ///S*匹配任何不是空白的字符
            Pattern = @"/bI/S*S/b";
            Matches = Regex.Matches(
                Text,
                Pattern,
                RegexOptions.ExplicitCapture    //提高检索效率
                );

            Console.WriteLine("从左向右匹配字符串：");

            foreach (Match NextMatch in Matches)
            {
                Console.Write("匹配的位置：{0} ", NextMatch.Index);
                Console.Write("匹配的内容：{0} ", NextMatch.Value);
                Console.Write("/n");
            }

            Console.WriteLine();

            //④匹配his 或者iis，其中忽略大小写
            Pattern = @"[h|i]is";
            Matches = Regex.Matches(
                Text,
                Pattern,
                RegexOptions.IgnoreCase |         //忽略大小写
                RegexOptions.ExplicitCapture    //提高检索效率
                );

            Console.WriteLine("从左向右匹配字符串：");

            foreach (Match NextMatch in Matches)
            {
                Console.Write("匹配的位置：{0} ", NextMatch.Index);
                Console.Write("匹配的内容：{0} ", NextMatch.Value);
                Console.Write("/n");            
            }

            Console.WriteLine();

            //⑤对Url的分组匹配
            Text = "http://192.168.0.1:2008";
            Pattern = @"/b(/S+)://(/S+)(?::(/S+))/b";
            Matches = Regex.Matches(Text, Pattern);

            Console.WriteLine("从左向右匹配字符串：");

            foreach (Match NextMatch in Matches)
            {
                Console.Write("匹配的位置：{0} ", NextMatch.Index);
                Console.Write("匹配的内容：{0} ", NextMatch.Value);
                Console.Write("/n");

                for (int i = 0; i < NextMatch.Groups.Count; i++)
                {
                    Console.Write("匹配的组 {0}：{1,4} ", i + 1, NextMatch.Groups[i].Value);
                    Console.Write("/n");
                }
            }

            Console.Read();