在正则表达式/Javascript中将字符交换为另一个

问题描述

我正在做类似的事情:

var a = "This is an A B pattern: ABABA";  
a.replace("A", "B");  
a.replace("B", "A");  

并返回:
=>这是一个B A模式:BABAB"
代替:
=>这是一个A A模式:AAAAA"

and have it return:
=> "This is an B A pattern: BABAB"
instead of:
=> "This is an A A pattern: AAAAA"

我首先想到的是做类似的事情:

My first thought is to do something like:

a.replace("A", "improbablePattern");  
a.replace("B", "A");  
a.replace("improbablePattern", "B");  

我该怎么做呢?

推荐答案

您可以将函数传递给 .replace() 调用与两个匹配的正则表达式，如下所示:

You could pass a function to your .replace() call with the regex that matches both, like this:

var a = "This is an A B pattern: ABABA";  
a = a.replace(/(A|B)/g, function(a, m) { return m == "A" ? "B" : "A"; });
alert(a);​ //alerts "This is an B A pattern: BABAB"

您可以在此处尝试

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