<?php $str = 'Love in My Antonia Love in'; preg_match_all('~(\b\w++(?> \w++)*)(?=.*?\b\1)~i', $str, $matches); // Remove duplicate found values from matches $array = array_unique(array_map('strtolower', $matches[1])); foreach ($array as $value) { // Remove found phrase / word from the end $str = preg_replace("~^.*\K(?<!\s)\s*\b$value~i", '', $str); } echo trim($str); // Love in My Antonia
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