Online PHP editor | refs for 38Csi

<?php $sentence = "One two three. Four five six. Seven eight nine. Ten eleven twelve. Thirteen fourteen fifteen."; for ($i = 1; $i <= 15; $i++) { if (preg_match('/^((?>(\s*\S+){' . $i . ',}?(?<=\.)))[^.]+\.\s*\S/', $sentence, $match)) { echo "Summary {$i}: {$match[1]}\n"; } else { echo "Full text {$i}: {$sentence}\n"; } }