/ # 开始符 < # 就是<这个字符 ( # 括号表示捕获, 意思是能在 正则的group函数中, 获取相应的值 ?: # 这个又取消括号的捕获功能, 就是上一行的说明无效了. . # 单个字符 | # 逻辑或的意思, 范围为括号中 \s # 空白 ) # 一对括号 * # 一个或多个, 这儿表示 一个或多个 括号中的内容 ? # 非贪婪, 表示 前面()* 这个组能少就少 > # 字符> /g # 表示全局搜索, 就是 match_all 的意思.

What you have here is the replacement function, which replaces with empty spaces

You can go to https://regex101.com/ and try it yourself. You can enter expressions on the left side. Enter the matched content of the test below. There is a detailed explanation on the right.
In addition, the|sin this regular expression is wasteful. You only need to write/<(?:.)*?>/g. If there is no need to operate on the capturing group, there is no need for non-capturing group. necessary. It can be simplified to/<.*?>/g