How to find spaces in field names in Notepad++

Let say you have the following query:

SELECT [Name],[Population],[Area km3]
FROM cities
WHERE Area='EU'

and you want to find if any of the field names contain any space.

To do this in Notepad++, you can just hit CTRL + F for Find window and the select the following:

• Find what: “(?<=\[)(\w+) "
• Flag Regular expression
• Do not flag . matches new lines