The copy I installed yesterday via automatic updates came without the .* in the “hard” version under:
failregex = ^%(__prefix_line_wp)sAuthentication attempt for unknown user .* from <HOST>$
Adding the missing .* solved the problem for me (didn’t block IPs).
@gniksic Thank you! This solved the same problem I was having, you rock. Also, thank you @invisnet for building such an awesome plugin ??