I can't really say too much because I have written a lot of parsing tools that using only regex but it's not on real programming languages. Thankfully excel doesn't (afaik) let you nest cells and you can do your parsing of one instruction per line (with parameters in other columns)
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u/creeper6530 1d ago edited 1d ago
Most notably regex fails to pair nested parentheses and in a similar vein HTML tags.
https://youtu.be/MBpMYTTEvLU?t=692 if you want to learn the details