C# 截取字符串基本

            #region --构建字符串处理

            string str1 = "123AAA456AAAA789AAAAAAA1011";

            string str2 = "123456789AAA23456789AAAA3456789AAAAAAA4567890";

            string str3 = "123456788AAA23456789AAAA3456789AAAAAAA4567890";

            string str4 = "123456788AAA0AAAA0AAAAAAA";

            var strArry = (str1 + "&" + str2 + "&" + str3 + "&" + str4).Split('&'); //把字符串连接为数组

            for (int i = ; i < strArry.Length; i++)

            {

                var serachstr1 = "AAA";

                var serachstr2 = "AAAA";

                var serachstr3 = "AAAAAAA";

                //查找3个A所在位置

                int index1 = strArry[i].IndexOf(serachstr1);

                //查找4个A所在位置

                var index2 = strArry[i].IndexOf(serachstr2, index1 + serachstr1.Length);

                //查找7个A所在位置

                var index3 = strArry[i].IndexOf(serachstr3, index2 + serachstr2.Length);

                //截取字符串

                var result1 = strArry[i].Substring(,index1);

                var result2 = strArry[i].Substring(index1 + serachstr1.Length, index2- (index1 + serachstr1.Length));

                var result3 = strArry[i].Substring(index2 + serachstr2.Length, index3-(index2 + serachstr2.Length));

                var result4 = strArry[i].Substring(index3 + serachstr3.Length);

            }

            #endregion

C# 统计字符串出现的次数

            string str1 = "123AAA456AAAA789AAAAAAA1011";

            char[] str1Arry = str1.ToArray();

            int js = ;

            List<int> TempArry = new List<int>();

            for (int i=;i< str1Arry.Length;i++)

            {

                if (str1Arry[i]=='A')

                {

                    js++;

                    continue;

                }

                if (js!=) //找到A, 不等于A时候执行

                {

                    TempArry.Add(js);

                    js = ; //js归0

                }

            }

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C# 截取字符串基本

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