Alphabet Does Not Go A to Z

[V0ldek]

We're going to examine a seemingly trivial task – look at some text and tell if it contains only alphabetic characters, or, in other words, letters. Simlarly, we might want to check if the text contains any letters, begins with a letter, etc. In any case, the root issue is telling whether a given character is a letter. And you're probably doing it wrong.

New Sourcery shenanigans available at:
https://v0ldek.com/sourcery/alphabet-does-not-go-a-to-z

[piotr-lewandowski]

Regexes were a mistake