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Any chance we'll see regex search in a future release?

Tato recenze je pro předchozí verzi doplňku (1). 

Very doubtful. It's not in the scope of this add-on I think, plus I wouldn't know where to start to implement something like that, as, currently, FBT doesn't mess anywhere with Firefox's find feature.

You could try https://addons.mozilla.org/en-US/firefox/addon/fastest-search/?src=search , I made a quick test and both add-ons seem to work correctly together (although I have no idea how that add-on works, I couldn't even find its regex feature, but it claims to have one).