Regular
Well Regulated, Systematic
い adjective
This is a combination of the words 規則 and 正しい, that you learned already. If you follow the correct rules everything will stay regular and well regulated.
きそくただしい
This is a combination of the words 規則 and 正しい, which you learned already, so you should be able to read this word too.
規則正しい生活を送って下さい。
Please live a regular life.