正则表达式匹配Regex101但不匹配preg_match或preg_match_all php函数

Question

$regex = "/<[^>]+>\s(.*)\s+(?=<[^>]+pt10 pb5">)/i";

$str = "</div>
         Quick and delicious appetizer with mince and bread for your feast menu. You can serve these mouth watering strips as a snack with noon tea.
         <div class="pt10 pb5">";

在regex101和regexr上测试并且在两者上工作正常但没有使用php函数，我也试图找到任何我需要逃脱但没有找到任何东西的角色。 提前求助