This is based on the ruleset in the Chrome extension based on a recent git checkout. <rule from="http://(leap3\.|www\.)?singlehop\.com/" to="https://$1.singlehop.com/"/> the to rule should not have a dot (or move the dot outside the capture) -- <rule from="!^!http://(?:www\.)?mystockoptions\.com/" to="https://$1mystockoptions.com/"/> the group should be capturing for $1 to work (www\.) --- <rule from="!^!http://(www\.)?tunisia-sat\.com(\.tn)?/" to="https://$1tunisia-sat.com$1/"/> The last part should be $2 ---- <rule from="!^!http://(www\.)?vn5socks\.com/" to="https://$1.vn5socks.com/"/> No dot in the replacement since $1 already captures the dot ---