I have found great script to have updated user.action file https://gist.github.com/0x46616c6b/3585720 using frequently updated filters from adblock. It does fine job replacing adblock related language into privoxy accepted version. However for some reason and I suspect that privoxy might still use old PCRE version as this bug is still open not all those ^ that are replaced into [/&:?=_] work. According to https://adblockplus.org/filters "Separator character is anything but a letter, a digit, or one...
compile fail with audacious 3.8.x