在Javascript中获取两个字符串之间的字符串的正则表达式 [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，但我在这里无法完全理解我的正则表达式.

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

我正在尝试编写一个正则表达式，它返回一个介于其他两个字符串之间的字符串.例如:我想获取位于字符串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".

我的奶牛总是产奶

会回来

总是给予"

这是我目前拼凑的表达方式:

Here is the expression I have pieced together so far:

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

然而，这将返回字符串cow always Gives".

However, this returns the string "cow always gives".

推荐答案

前瞻((?= 部分)不消耗任何输入.它是一个零宽度断言(边界检查和lookbehinds也是如此).

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

您想要在这里进行常规匹配，以消耗 cow 部分.要捕获两者之间的部分，请使用捕获组(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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