if you meant that you want to print the line with the regex and the next line to it
then simply add last; in the first if section

if($found)
 {
  print "$line";
  last;
 }
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this will get you the output

startdexdbnjcrk
this when be shown
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UPDATE:and if you want to print more lines then youll be needing a counter and check each time with "if" weather the desired number of lines have been printed or not. if yes then exit.

there be many shortcuts but i guess this one is the simplest for a newbie like me to understand