Regex to insert a space between uppercase and lowercase letters

I have text like

CacciaMagazineOttobre2020
RumoreFebbraio2021

To add a space between letters and numbers in this way

CacciaMagazineOttobre 2020
RumoreFebbraio 2021

I use this regex

Find: ([a-z])([0-9])
Replace: \1 \2

I try to understand how insert a space between uppercase and lowercase letters to have this final output

Caccia Magazine Ottobre 2020
Rumore Febbraio 2021

I try a regex like

Find: ([a-z])([A-Z])
Replace: \1 \2

but doesn't work.

1 Answer

Here is a way to go:

• Ctrl+H
• Find what: (?<=[a-z])(?=[A-Z0-9])
• Replace with: A SINGLE SPACE
• CHECK Match case
• CHECK Wrap around
• CHECK Regular expression
• Replace all

Explanation:

(?<=[a-z]) # positive lookbehind, make sure we have a small letter before current position
(?=[A-Z0-9]) # positive lookahead, make sure we have an uppercase or a digit after

Screenshot (before):

Screenshot (after):