`-Filter` will throw an exception on a malformed regex

[tig]

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Prerequisites

• [X] Write a descriptive title.
• [X] Make sure you are able to repro it on the latest version
• [X] Search the existing issues.

Steps to reproduce

Reported here: https://github.com/gui-cs/F7History/issues/15

ls | ocgv -Debug -Filter .\k

Expected behavior

ls | ocgv -Debug -Filter .\k


The error message should occur as an error in the GUI like in visuals below

Actual behavior

Error on command line.

Error details

No response

Environment data

na

Version

0.76

Visuals