我可以在正则表达式中使用OR而不捕获其中包含的内容吗? [英] Can I use an OR in regex without capturing what's enclosed?
问题描述
我正在使用 rubular.com 构建我的正则表达式,其文档描述了以下内容:
I'm using rubular.com to build my regex, and their documentation describes the following:
(...) Capture everything enclosed
(a|b) a or b
如何使用OR表达式而不捕获其中的内容?例如,假设我要捕获 ac或 bc。我不能使用正则表达式
How can I use an OR expression without capturing what's in it? For example, say I want to capture either "ac" or "bc". I can't use the regex
(a|b)(c)
对吗?从那时起,我在一个组中捕获了 a或 b,而在另一组中捕获了 c,但并不相同。我知道我可以过滤捕获的结果,但这似乎需要更多工作...
right? Since then I capture either "a" or "b" in one group and "c" in another, not the same. I know I can filter through the captured results, but that seems like more work...
我错过了明显的东西吗?
Am I missing something obvious? I'm using this in Java, if that is pertinent.
推荐答案
根据正则表达式实现,您可以使用所谓的非捕获组,语法为(?:…)
:
Depending on the regular expression implementation you can use so called non-capturing groups with the syntax (?:…)
:
((?:a|b)c)
此处(?: a | b)
是一个群组,但您无法引用其匹配项。因此,您只能引用((?: a | b)c)
的匹配项,即 ac
或 bc
。
Here (?:a|b)
is a group but you cannot reference its match. So you can only reference the match of ((?:a|b)c)
that is either ac
or bc
.
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