Note that @tamasgal’s example only detects lowercase letters. To also detect uppercase letter, you also need to check against 0x41 through 0x5a. It’s probably also easier to understand if you write this as 'a' <= c <= 'z' || 'A' <= c <= 'Z', so you don’t convert toUInt8 first and have to remember all the ASCII codes, since you can just compare Chars directly.
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