Catching and moving tabs with short domains correctly (x.com instead of box.com)

[glciampaglia]

Is your feature request related to a problem? Please describe.
The default way to enter regular expressions for catching and moving tabs causes issues with very short domains, like x.com. In that case, specifying the expressions as instructed in the tooltop (x\.com) ends up catching and moving tabs for ANY domains that end with the same suffix, like box.com, because of the trailing box.com in the domain.

Describe the solution you'd like
After some testing I found that if you specify the regex as \bx\.com instead of just x\.com (that is, pre-pending \b to match the word boundary at the beginning of a word) solves the issue.

So one possibility could be to always add \b to the expression before matching it; the user would not need to do anything.

Describe alternatives you've considered
Alternatively you could let the user decide but add a warning in the tooltip about short domains like x.com.

Additional context
In my case the problem was that I have a tab group for social media and I would like to catch and move only the tabs of X (old Twitter) to that particular group, not the tabs of Box.com (a cloud storage service which I use for work).