I like to find international text, like "müller", or even chinese text, in files, no matter which unicode representation and case is used.
I.e, it should not matter whether the "ü" is stored in NFC or NFD format.
I'd think that grep could do this, but at least the version available on macOS 10.13.6 finds only one normalization form.
I'd expect that, with algorithms like Aho–Corasick that can search for alternatives of letters in words, it should not be so difficult to build a tree that includes every alternative form of a UTF8 character and then search for all combinations. Yet, at least the grep I tried doesn't do that.
Are there implementations of grep or other text find tools that can do this properly?