Online PHP editor | output for JpPZG

<?php $blacklist = ["subsp.", "var.", "f.", "(voir)", "hybride"]; $prepped = array_map('preg_quote', $blacklist); // escape special characters $prepped[] = "'\S+'"; // do not escape special characters $negLookAhead = '(?!' . implode('|', $prepped) . ')'; $firstTwoWords = '(?:^\S+\s\S+)'; $regex = '#' . $firstTwoWords . '|(?<=\s)' . $negLookAhead . '\S+(?=\s|$)#'; $names = [ "Androsace angrenica 'Angelica' subsp. Violaceae", 'Allium obliquum', 'Allium ostrowkianum (voir) A. oreophilum', 'Allium senescens subsp. glaucum', 'Allium sikkimense', 'Androsace × pedemontana', ]; // echo $regex; var_export( preg_replace($regex, '<em>$0</em>', $names) );