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

I am using the solution by @PeterWong and it works great as long as the string you're checking against doesn't contain any special characters (as pointed out in the comments).

However if you want to use it for strings like "Überall", just add this slight modification:

utf_pattern = Regexp.new("\\p{Lower}".force_encoding("UTF-8"))

a = "Go234"
a.match(utf_pattern) # => #

b = "GO234"
b.match(utf_pattern) # => nil

b = "ÜÖ234"
b.match(utf_pattern) # => nil

b = "Über234"
b.match(utf_pattern) # => #

Have fun!