Difference between regex [A-z] and [a-zA-Z]

Question

I am using a regex to program an input validator for a text box where I only want alphabetical characters. I was wondering if [A-z] and [a-zA-Z] we

Answer 1

Take a look at the ASCII chart (which Java characters are based on): there are quite a few punctuation characters situated between Z and a, namely these:

[\]^ _`