checking for upper case letter on string

Hello all, I need to check if there are any upper case letters on a given string. There can be one or more letters that might be upper case on a given string no matter their position within the string. Is there any way to check for it? obs: I do not want to convert to lowercase, but to check for the presence of upper case letters. I copuld iterate through the string and evaluate each caracter but I wonder if there is a more effective method to achieve that. examples: uyYmfawelk = returns true YlsngfswU = returns true

kjnsdfW      = true
fwerg;m     = false

thanks in advance.