How can I ignore an uppercase character in my GREP command?

Hello! I am creating a recipe book, and have written a GREP command that applies a character style to the numerals (measurements) in my ingredients list. The command is:

^.+?\u

This command is intended to include everything in the paragraph up until the first uppercase character (but not including the first uppercase character). This expression, however, is applying the style to the first uppercase character. How can I change the expression so that it omits that first uppercase character? Thanks so much!