Python regex：<a> tag

Question

I know I got BeautifulSoup, But I want to try my own.

Regex I've been working on

之间的文本

<br>This Text needed
<a>unwanted text</a>
<br/>
This text needed
<a >unwanted text</a>
 This text needed
<a>unwanted text</a>
<br>this text needed

我想出了什么：

(</a>|(<br(/>|>)))(\s.*|\w.*)

我想匹配This text needed，但其中之一不匹配。

Answer 1

以这种方式，先行否定和后退积极，

(?<!<a>)This Text needed(?!<\/a>)

演示： https://regex101.com/r/RT5LZu/1