How do i match something based on the number of strings? [closed]

You could do that with a simple Regex, But you should really read some MSDN articles before you try to “use them”

 // Match a Regex and Do Stuff
        public void showMatch(string input, string expr)
        {
            MatchCollection mc = Regex.Matches(input, expr); 
            int num = 0;  
            foreach (Match m in mc)
            {
                string tm = m.ToString();
                num++;
                if (num == 1)
                {
                    // Do Stuff if 1 match.
                }
                if (num == 2)
                {
                    // Do Stuff if 2 matches.
                }
            }
       }


            // showMatch(input, @"(?:[0-9]+){17}");

MSDN Article

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