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find a period (followed by zero or more word characters) followed by an underscore (followed by 0 or more of any character matched pessimistically) followed by a word boundary replace with a period $1 $2 you might have to repeatedly run this replacement as it only removes the first underscore in any...

You can also get some more info in ^ $ and matching of newlines and the way any character matching like . doesn't match newlines here: http://www.perl.com/doc/manual/html/pod/perlre.html

So, you think there's a bug in the Perl RegEx engine of UE 12.00 (no hotfix)? Well, read this post I just wrote elsewhere and see if it helps your understanding. What you may think is a bug might just be because UE isn't quite Perl syntax compliant and you're trying to use it with Perl syntax. It ca...