Regex Remove Lines Not Containing a Character

Use this regex pattern to remove lines not containing a character.

I want to remove lines that don’t contain a space.

^(?!.* .*).+$

Or remove lines that don’t contain numbers.

^(?!.*[0-9].*).+$

Or remove lines that don’t contain UPPER CASE.

^(?!.*[A-Z].*).+$

Or remove lines that don’t contain letters

^(?!.*[A-Za-z].*).+$

Or remove lines that don’t contain an email

^(?!.*@.*).+$