(Feature request) Regex search in all notes

[CsatiZoltan]

Describe feature

As someone with an ever-growing knowledge base, I find it more and more difficult to find the text I want. However, I often remember in what context it is, so a searching method based on regex would help.

Additional Information

This issue is not the same as #147, which asks for regex within a note (Ctrl + F). My request concerns regex search in the quick search field in the top left corner (Ctrl + S).