请问这样的正则如何写啊？

Question

<span id="ctl00_ContentPlaceHolder1_lbltitle1" class="default_text3">新闻标题1 </span>...... 
<span id="ctl00_ContentPlaceHolder1_lbltitle25" class="default_text3">新闻标题24 </span>...... 
<span id="ctl00_ContentPlaceHolder1_lbltitle32" class="default_text3">新闻标题32 </span>...... 
<span id="ctl00_ContentPlaceHolder1_lbltitle45" class="default_text3">新闻标题25 </span>......
<span id="ctl00_ContentPlaceHolder1_lbltitle54" class="default_text3">新闻标题14 </span>...... 
<span id="ctl00_ContentPlaceHolder1_lbltitle52" class="default_text3">新闻标题245 </span>......我想提取网页源码其中的文字“新闻标题25”，请问应该如何写这样的正则表达式

Answer 1

新闻标题25 对应的id一定是ctl00_ContentPlaceHolder1_lbltitle45？

Answer 2

如果上面成立，使用如下正则：(?is)(?<=<span[^>]*?(?=id="ctl00_ContentPlaceHolder1_lbltitle45")[^>]*>).*?(?=</span>)