c# - Looking for a tag in a txt doc -

ok tried things sugested, still not working me. not sure why not kick out output , it puts out put not right. doing wrong.

 inputbox = input.text;         int x = 1;         var lines = input.text.split(new string[] { environment.newline },stringsplitoptions.none);          (var index = 0; index < lines.length; index++)         {              var line = lines[index];                          {                 x++;                 system.console.writeline("'{0}'", inputbox);                 bool test1 = inputbox.startswith("11600");                 bool test2 = inputbox.endswith("(");                 if (test1 && test2)                 {                     int first = inputbox.indexof("11600");                     int last = inputbox.lastindexof("(");                     inputbox = inputbox.substring(first, last - first);                 }             }             while (x < 50);             system.console.writeline("'{0}'", line);             if ((line.startswith("11600") && line.endswith("(")))             {                 messagebox.show("these errors in line" + index + ": " + line);                 break;             }          } 

this:

inputbox = inputbox.substring(last, first - last); 

probably needs this:

inputbox = inputbox.substring(first, last - first); 

may need add or subtract 1 depending on whether or not want include w or 0. run in debugger see actual numbers , should able diagnose more quickly.