(?=X) X, via zero-width positive lookahead
(?!X) X, via zero-width negative lookahead
(?<=X) X, via zero-width positive lookbehind
(?<!X) X, via zero-width negative lookbehind
(?>X) X, as an independent, non-capturing group
这几个是什么意思,不知怎么使用,想要一些说明问题的列子说明
(?!X) X, via zero-width negative lookahead
(?<=X) X, via zero-width positive lookbehind
(?<!X) X, via zero-width negative lookbehind
(?>X) X, as an independent, non-capturing group
这几个是什么意思,不知怎么使用,想要一些说明问题的列子说明
只有前面有a的b才能匹配到,a本身不参与匹配,只是作为一个条件而已
比如"ab",匹配到的是b,"bb"将匹配失败
lookbehind 反向预搜索
嗬嗬,我感觉这属于正则比较难的东西了