Take a look at Alternative search extension
After installation you could invoke dialog with Ctrl+H
Make sure that "Regular expression" in "More options" is checked.
For your particular case regexp will be
.*\s
"." matches all characters (like * in Excel)
".*" matches all number of characters (even if there is none of them)
and "\s" matches any (one) whitespace
If you want to preserve space, type space in "Replace with" filed
Also, take a look at this:
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/n4Nhs.png)
Note: I would highly recommend you to read the book on regular expressions, if you want to complete complex tasks with them, because they are a lot more powerfull, than usual "*?" masks. Also, you can use them in formulas.