replace uppercase letters with space in sublime

I am trying to process the following two lines in Sublime :

2013-12-26T23:24:42Z

test

I just want to replace the capital (uppercase) letters with a space. I searched for T|Z, but it selects the lowercase 't' in test in the second line.

Is there a way to select only the uppercase letters? I just want to replace uppercase letters with a space.

Thanks,