> It's actually a bad idea in this case because regex is mostly the same in every modern language, so if you know it, you know it everywhere. What you don't kno

> It's actually a bad idea in this case because regex is mostly the same in every modern language, so if you know it, you know it everywhere. What you don't know is this. I disagree, at least in my experience there are significant differences between multiple regex engines I'm used to use regularly. In no particular order: are parens and other operators treated literally by default or do they need to be escaped? Are character class like '[:alpha:]' understood, or do I need to write them explicitly? Similarly, do I have access to \w \W \s and friends? Can I use + to mean {1,} ? Can I use '?' to match 0 or 1 (common) or do I have to use = (vim)? Or maybe just {0,1}? But then should I escape the braces? Do I have recursion? Do I have named captures? Those are not theoretical concerns, that's stuff I routinely end up getting wrong because I forget that this one feature that works in pcre does not work in vim or works differently in sed etc...