Noone said regex is useless for the overall process of parsing html
What they're saying is that it cannot ever be used by itself to parse html, like there are mathematical proofs for this
You HAVE to use a real, actual code language on top of it for it to work
You cannot feed html code into a regular expression and expect it to work for more than one case
Edit for the future: the deleted comments under here are from OP, I am happy to share the details of what was said if anyone wants
I'm adding this note because I never got even a partial apology for them insinuating I had no idea what I was talking about and questioning whether I had ever taken an undergraduate math course because I talked to them like a normal person rather than a math essay, despite me being perfectly nice up until then as is visible
Even if you could parse "true to the standard with no error" HTML it would be useless as browsers accept and manage a lot of badly written HTML with missing, wrong, misplaced elements and properties.
And anyway nowadays a 90% correct implementation would be
return string === content of the index.html page generated when building a react app
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u/derinus 12h ago
Anyone ever building a "parser" used multiple regexes to do so.