string A = "a bb 1 bb 1 2 bb 1 -7.0 3 cc 1 cc 1 2 cc 1 2 3 ";
            string B = "bb";
            int index = 2;
            int strIndex = 3;
            Regex reg = new Regex(string.Format(@"(?:\s{0}(?:\s[\d.-]*)*){{{1}}}\s{0}(\s[\d.-]+)+", B, strIndex - 1));
            Console.WriteLine(reg.Match(A).Groups[1].Captures[index - 1].Value);
================================================================================
            A = " a aa aa aa aa aa aa 0.1 0.2 -0.3 4 5 6.0 -7.0";
            B = "aa";
            index = 7;
            strIndex = 5;
            reg = new Regex(string.Format(@"(?:\s{0}(?:\s[\d.-]*)*){{{1}}}\s{0}(\s[\d.-]+)+", B, strIndex - 1));
            Console.WriteLine(reg.Match(A).Groups[1].Captures[index - 1].Value);

------解决方案--------------------
探讨

lz怎么又开了个帖。

C# code


   string A = "a bb 1 bb 1 2 bb 1 -7.0 3 cc 1 cc 1 2 cc 1 2 3 ";
            string B = "bb";
            int index = 2;
            int strIndex = 3;
            Regex ……


------解决方案--------------------
探讨

lz怎么又开了个帖。

C# code

   string A = "a bb 1 bb 1 2 bb 1 -7.0 3 cc 1 cc 1 2 cc 1 2 3 ";
            string B = "bb";
            int index = 2;
            int strIndex = 3;
            Regex re……