Use replaceRE on multiple elements

How could you extend this to replaceRE also h1, h2, h3, etc…

Hi. I split your post to a new topic since the previous one was already solved.

To answer your question, you could do something like (typed from phone so untested)

{{ $content := .Content | replaceRE "<p>" "<p class=\"mb4 px3\">" }}
{{ $content = $content | replaceRE "<h1>" "<h1 class=\"mb4 px3\">" }}
Etc. Etc.
{{ $content | safeHTML }}
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Thank You!!!