规律：for example, newton's law is a 规律. anyway, people observes some phenomenon and summarize something. the things which are summarized are called 规律. another example, u get up at 7:00 and sleep at 22:00 everyday. this is ur 生活规律---living law. the character 规 means something which is created by people to limit something, to create some rule. for example, 圆规---bow compass the character 律 means something that we MUST observe. for example, 法律---law 规则：rule, such as 游戏规则 规定：it is almost the same with 规则. this word highlights that the rule cant be broken. for example, 这是公司的规定，每个人都必须遵守。 we dont use 规则 here. 规章：a system of rule. for example, 这份100页的材料是公司的规章制度. the character 章 means chapter. 规矩：implicit rules of a society. for example, parent tells child that people mustn't say anything while eating. this is a 规矩. if u dont do like this, we say: 你没规矩。 another phrase: 我们做事必须有规矩，不能没规矩。

你需要一本汉语字典。 规律：you can regard it as a rule of nature.It is objective.For example,sun rise at the east,fall in the west. 规则与规定：规则is only a noun.it's meaning equal to 规定。For example,you should follow game's rule.But 规定 is also verb,you can say,law 规定 us do not do something. 规矩：Actually，it is also equal to 规则，规定，and it is noun,but it is informal，you can see it in some Chinese TVshows. 规章：it is some rules,Provisions of company, For example,as a worker,you should follow your company's 规章。 Read dictionary,it will help you. :)