Sublime Text: Regex to convert Uppercase to Title Case?

Question

I have a bunch of labels in a text file (e.g. MY LABEL:) that I need to make title case.

I already know how I would make them all lower or upper case.

For ex

Answer 1

Find: ([A-Z])([A-Z]+)\b

Replace: $1\L$2

Make sure case sensitivity is on (Alt + C) and preserve case is off (Alt + A).