正则表达式匹配组数

Question

我正在学习正则表达式，遇到了一个问题。我有以下内容:

href="http://google.com/topic/713725-dogs-are-great-3"> href="http://google.com/topic/213225-humans-are-great"> href="http://google.com/topic/342315-cats-are-great-but-small">

用这段代码href="(?:[^"]*)topic/([^<]*)">

i can select

713725-dogs-are-great-3 213225-humans-are-great 342315-cats-are-great-but-small

但是我只想匹配数字

342315213225713725

任何想法?

Answer 1

对于显示的示例和尝试，请尝试以下正则表达式;这将创建一个捕获组，您可以使用它来捕获匹配的值。

bhref="(?:[^"]*)topic/(d+)-.*">$

正则表达式的在线演示

解释:为以上内容添加详细说明。

bhref="          ##Matching href using b before it as a word boundary followed by =" here.
(?:[^"]*)topic/  ##In a non-capturing group matching till " everything till topic/
(d+)             ##Creating 1st capturing group which has digits in it.
-.*">$            ##Matching everything till " followed by "> till end of value.