How can I check a word is already all uppercase?

Question

I want to be able to check if a word is already all uppercase. And it might also include numbers.

Example:

GO234 => yes
Go234 => no
         


        

Answer 1

a = "Go234"
a.match(/\p{Lower}/) # => #

b = "GO234"
b.match(/\p{Lower}/) # => nil

c = "123"
c.match(/\p{Lower}/) # => nil

d = "µ"
d.match(/\p{Lower}/) # => #

So when the match result is nil, it is in uppercase already, else something is in lowercase.

Thank you @mu is too short mentioned that we should use /\p{Lower}/ instead to match non-English lower case letters.