正则表达式匹配字符之间的所有内容

Question

我有一个看起来像这样的网址：/events/eventID/something

我该如何匹配eventID 无论eventID有多长，它都应该起作用。

有人可以帮助我吗？

Answer 1

您可以使用前瞻：

x(?=y) – positive lookahead (matches 'x' when it's followed by 'y')
x(?!y) – negative lookahead (matches 'x' when it's not followed by 'y')

，您还可以使用lookbehinds：

(?<=y)x – positive lookbehinds (matches 'x' when it's precede by 'y')
(?<!y)x – negative lookbehinds (matches 'x' when it's not precede by 'y')

您的情况的示例：

/(?<=.\/)[^\/]+(?=\/)/

或

(?<=.\/).+(?=\/)