正则表达式在Javascript中获取两个字符串之间的字符串 [英] Regular Expression to get a string between two strings in Javascript

问题描述

我发现了非常相似的帖子，但我不能在这里得到正则表达式。

I have found very similar posts but I can't quite get my regular expression right here.

我正在尝试写一个正则表达式，它返回一个字符串在两个其他字符串之间。例如：我想得到字符串cow和milk之间的字符串

I am trying to write a regular expression which returns a string which is between two other strings. For example: I want to get the string which resides between the strings "cow" and "milk"

我的牛总是给牛奶

My cow always gives milk

将返回

always give

"always gives"

这是我到目前为止拼凑的表达式：

Here is the expression I have pieced together so far:

(?=cow).*(?=milk)

然而这返回字符串cow always give

However this returns the string "cow always gives"

推荐答案

前瞻（（？= part）不消耗任何输入。它是零宽度断言（边界检查和lookbehinds）。

A lookahead (that (?= part) does not consume any input. It is a zero-width assertion (as are boundary checks and lookbehinds).

你想要在这里进行常规匹配，要消耗 cow 部分。要捕获其间的部分，可以使用捕获组（只需将要捕获的模式部分放在括号内） ）：

You want a regular match here, to consume the cow portion. To capture the portion in between, you use a capturing group (just put the portion of pattern you want to capture inside parenthesis):

cow(.*)milk

根本不需要前瞻。

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