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Parser(s)? As in more than one? Hopefully you’ll ever need to only write one parser (e.g. for Rust) but practically zero since regexs are a solved problem.

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Yes. I wrote Rust's regex crate. The parser has gone through a couple rewrites (and another one is ongoing), so that's where the plural came from. :)

Regexes can't be used for parsing (e.g. the language of balanced parantheses)

I think your parent post referred to using a parser to parse regexes, not using regexes to parse another language.

Regular languages cannot. Many (most?) implementations of “regular expressions” can express more complex grammars.

(My sibling is also correct)

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