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use of (?= ... ) makes all replacement variables $0, $1... blank.

btw, (framebox) highlighting sometimes is not visible and it doesn't take syntax elements options into account

I don't understand, give me example of RexEx which you search for.

> (framebox) highlighting sometimes is not visible
I don't understand too. can you give details, screenshot?

I reproduced problem with blank $1, $2.
File text: aaa bbbccc
Search for regex: (\w+)\s+(\w+)(?=ccc)
Replace with: $2/$1

I will investigate it, thanks.

RegEx blank variables $0 $1.... are fixed, wait for the update.
Tell me detailed description about 2nd issue.