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<?php $allowed = ['<b>', '<i>', '<u>', '<em>', '<p>', '<br>', '<table>', '<tr>', '<td>', '<th>', '<tbody>', '<thead>', '<tfoot>', '<ul>', '<li>', '<ol>', '<strong>']; $test = 'Toch is dit raar !! <b>bold!!</b>'; $expression = '/<[^>]*>/'; preg_match_all($expression, $test, $matches); print_r($matches[0]); foreach ($matches[0] as $tag) { $tag = str_replace(' />', '>', $tag); $tag = str_replace('/>', '>', $tag); $tag = str_replace('</', '<', $tag); echo 'test ' . $tag; if (!in_array($tag, $allowed)) { die('bad!!'); break; } else { die('ok'); } }