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<?php $allowed = ['<b>', '<i>', '<u>', '<em>', '<p>', '<br>', '<table>', '<tr>', '<td>', '<th>', '<tbody>', '<thead>', '<tfoot>', '<ul>', '<li>', '<ol>', '<strong>']; $expression = '/<[^>]*>/'; preg_match_all($expression, '<b style="df">', $matches); foreach ($matches[0] as $tag) { $tag = str_replace(' />', '>', $tag); $tag = str_replace('/>', '>', $tag); $tag = str_replace('</', '<', $tag); if (!in_array($tag, $allowed)) { $this->context->buildViolation($constraint->message) ->setParameter('{{ value }}', $value) ->addViolation(); break; } }