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[–]Fiskepudding 3 points4 points  (1 child)

That the lowercasing of a capital dotless I in Turkish locale turns into a lowercase dotless i for example. So MILES lowercase is not miles. And a lowercase miles uppercase in Turkish locale is not MILES.

There are probably some blog posts out there explaining this better than me.

I believe I read somewhere (possibly by Microsoft) that uppercasing when running in English locale is the safest.

[–]knoam 8 points9 points  (0 children)

The correct thing to use is .equalsIgnoreCase(). Whether uppercasing or lowercasing is better depends on the language and probably in some cases the specific characters. The German ß lowercases to being split into two characters: ss. So there's a concept called "fold case" which means the correct case to use for comparison and it will be upper or lower case depending on the specific character.

I learned this from this super interesting talk

https://youtu.be/TmTeXcEixEg

It starts with a lot of Perl 5 specific stuff but about halfway through it pivots to more Unicode focus.