问题描述
我正在将基于boost的正则表达式转换为C ++ 11正则表达式。我有一个名为 url
的捕获组:
I am converting my boost-based regular expressions to C++11 regex. I have a capture group called url
:
\s*?=\s*?(("(?<url>.*?)")|('?<url>.*?)'))
通过增强,如果您有 smatch
,则可以调用 match.str( url)
以按名称获取捕获组。使用 std :: smatch
,我只能看到索引子匹配项。
With boost, if you had an smatch
you could call match.str("url")
to get the capture group by name. With std::smatch
, I am only seeing indexed sub-matches.
如何访问使用std :: smatch类进行url捕获?
How can I get access to the url capture using the std::smatch class?
推荐答案
您不能使用c ++ 11标准命名捕获组。 C ++ 11正则表达式符合ECMAScript语法。这是一个说明所有内容的链接。即使您考虑一下这可能会令人失望,但真正的正则表达式将不支持此功能。
You cannot name a capture group with the c++11 standard. C++11 regex conforms to the ECMAScript syntax. Here is a link that explains it all http://www.cplusplus.com/reference/regex/ECMAScript/. Even though this maybe disappointing if you think about it a true regular expression will not support this it is extra.
这篇关于C ++ 11正则表达式捕获组的名称的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!