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]);

But what if I have:

var firstvariable = cow;

var secondvariable = milk;



var test = My cow always gives milk;

I've tried various things including:

var testRE = test.match(firstvariable(.*)secondvariable);

alert(testRE[1]);

and:

var testRE = testRE.match + '(' + firstvariable + (.*) + secondvariable +')';

alert(testRE[1]);

Neither worked.