使用javascript在两个字符串之间获取字符串 [英] get string between two strings with javascript

问题描述

如何使用与变量匹配的两个字符串之间获取字符串？如果我使用匹配字符串，则以下代码很有效正则表达式在Javascript中获取两个字符串之间的字符串我还尝试在 JavaScript - 在字符串匹配中使用变量：

How do I get a string between two strings using match with variables? The following code works well if I use match with strings Regular Expression to get a string between two strings in Javascript I also tried to apply the info at JavaScript - Use variable in string match :

var test = "My cow always gives milk";

var testRE = test.match("cow(.*)milk");
alert(testRE[1]);

但如果我有：

var firstvariable = "cow";
var secondvariable = "milk";

var test = "My cow always gives milk";

我尝试过各种各样的事情，包括：

I've tried various things including:

var testRE = test.match("firstvariable(.*)secondvariable");
alert(testRE[1]);

和：

var testRE = testRE.match + '("' + firstvariable + "(.*)" + secondvariable +'")';
alert(testRE[1]);

两者均无效。

推荐答案

试试这个：

test.match(new RegExp(firstvariable + "(.*)" + secondvariable));

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