我需要删除许多长文本文件中？highlight 和 understate“> 之间的所有内容。
\？。**在问号后找到所有内容，但不知道如何在 understate“> 处结束它。
例如：
发件人：
<a class="title" href="threads/3793631-The-PatFinSub-1?highlight=patfinsub" id="thread_title_2683239" title="" ...blablabla...</a>
<span id="thread_prefix_3793631" class="prefix understate">
<a class="title" href="threads/3794669-The-PatFinSub-2?highlight=patfinsub" id="thread_title_2683239" title="" ...blablabla...</a>
<span id="thread_prefix_3794669" class="prefix understate">
<a class="title" href="threads/3794923-The-PatFinSub-12?highlight=patfinsub" id="thread_title_2683239" title="" ...blablabla...</a>
<span id="thread_prefix_3794923" class="prefix understate">
<a class="title" href="threads/3795869-The-PatFinSub-25?highlight=patfinsub" id="thread_title_2683239" title="" ...blablabla...</a>
<span id="thread_prefix_3795869" class="prefix understate">
<a class="title" href="threads/3796672-The-PatFinSub-29?highlight=patfinsub" id="thread_title_2683239" title="" ...blablabla...</a>
<span id="thread_prefix_3796672" class="prefix understate">
收件人：
<a class="title" href="threads/3793631-The-PatFinSub-1
<a class="title" href="threads/3794669-The-PatFinSub-2
<a class="title" href="threads/3794923-The-PatFinSub-12
<a class="title" href="threads/3795869-The-PatFinSub-25
<a class="title" href="threads/3796672-The-PatFinSub-29
如何在记事本++中使用正则表达式解决此问题？