正则表达式忽略问号符号后的所有内容 [英] Regexp that ignores everything after a question mark symbol

问题描述

这是我要使用正则表达式解析的完整字符串:

This is the full string I'm trying to parse with regular expressions:

example.com/newsite.com.html?var=/newsite.com&var=newsite.com

我希望能够匹配字符串的newsite.com部分，但前提是该字符串不出现在?符号之后.

I would like to be able to match newsite.com part of the string but only if it does not appear after the ? symbol.

目前，我到现在为止:

/newsite.com/g

选择newsite.com的所有实例，而不是第一个.

Which selects all the instances of newsite.com instead of just the first one.

链接到正则表达式游乐场 http://regexr.com/3fmre

Link to the regexp playground http://regexr.com/3fmre

这里*表示我想忽略的所有内容，基本上只匹配第一次出现的newsite.com:

Here * represents everything I would like to ignore, essentially matching only the first occurrence of newsite.com :

example.com/newsite.com.html?****************************

推荐答案

这是我想出的解决方案，它不是防弹的，但在大多数情况下都有效:

This is the solution I came up with, it's not bullet-proof but works for the most part:

(?<=[^=]\/)newsite\.com

它将忽略以=开头且开头没有/的任何内容.

It ignores anything that starts with = and doesn't have a / in the beginning.

请注意，这仅适用于支持正向后看"的正则表达式实现.

Note that this only works with regex implementations that support "positive lookbehind".

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