redo is usually good for that. 
while (<$fh>) {
   chomp;
   if (... && !eof($fh)) {
      $_ .= <$fh>;
      redo;
   }

   ...
}

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In reply to Re^8: last in a do while loop (for (;;)) by ikegami
in thread last in a do while loop by gam3

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