什么是正则表达式“独立捕获组”？ [英] What is a regex "independent capturing group"?

问题描述

来自Java 6 模式文档：

From the Java 6 Pattern documentation:

特殊构造（非捕获）

Special constructs (non-capturing)

（？：的 X 的）   的 X 的，作为非捕获组

(?:X)   X, as a non-capturing group

...

（？> X ）    X ，作为一个独立的非捕获组 p>

(?>X)   X, as an independent, non-capturing group

在（?: X）和之间（？> ; X）有什么区别？ 独立在这种情况下意味着什么？

Between (?:X) and (?>X) what is the difference? What does the independent mean in this context?

推荐答案

这意味着分组是 atomic ，它会丢弃匹配组的回溯信息。所以，这种表达是占有欲的;它不会退缩，即使这样做是整个正则表达式成功的唯一途径。它是独立的，因为它不会通过回溯与正则表达式的其他元素合作以确保匹配。

It means that the grouping is atomic, and it throws away backtracking information for a matched group. So, this expression is possessive; it won't back off even if doing so is the only way for the regex as a whole to succeed. It's "independent" in the sense that it doesn't cooperate, via backtracking, with other elements of the regex to ensure a match.

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