3, filter some of the HTML tags of the regular expression of the exclusion (such as excluding <p>, that is, do not filter <p>):
</? [^pp/>]+>
4, filter some of the HTML tags of the regular expression of the enumeration (such as the need to filter <a><p><b>):
</? [AAPPBB] [^>]*>
5, filter the exclusion of regular expressions for the properties of some HTML tags (such as excluding the ALT attribute, which does not filter the ALT attribute):
S (?!) ALT) [a-za-z]+=[^s]*
6, the enumeration of regular expressions that filters the properties of some HTML tags (for example, the ALT attribute):
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