正则表达式 (.*?) 和 (.*) 之间有什么区别? [英] What is the difference between the regex (.*?) and (.*)?

问题描述

我已经做了一段时间的正则表达式，但我不是特定规则的微妙之处的专家，我总是用 (.*?) 进行匹配，但是用限制，正如我所理解的那样，它会停止它获得的第一次机会，而 (.*)? 会继续并且更加贪婪.

I've been doing regex for a while but I'm not an expert on the subtleties of what particular rules do, I've always done (.*?) for matching, but with restriction, as in I understood it would stop the first chance it got, whereas (.*)? would continue and be more greedy.

但我没有真正的理由这么想，我只是因为我从前读过它而这么想.

but I have no real reason why I think that, I just think it because I read it once upon a time.

现在我想知道，有区别吗?如果是，那是什么...

now I'd like to know, is there a difference? and if so, what is it...

推荐答案

(.*?) 是一个包含非贪婪匹配的组.

(.*?) is a group containing a non-greedy match.

(.*)? 是包含贪婪匹配的可选组.

(.*)? is an optional group containing a greedy match.

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