javascript - 如果替换有 $'，replace 方法会产生意想不到的结果

Question

当替换字符串有$'字符时，将方法结果替换为奇怪的字符串。

示例:https://jsfiddle.net/1jns2eo9/

var p = 'The quick brown fox jumps over the lazy dog. If the dog reacted, was it really lazy?';

var regex = /dog/gi;

document.getElementById('first').innerHTML = p.replace(regex, '$');
/// The quick brown fox jumps over the lazy $. If the $ reacted, was it really lazy?
document.getElementById('second').innerHTML = p.replace(regex, "$'");
/// The quick brown fox jumps over the lazy . If the dog reacted, was it really lazy?. If the reacted, was it really lazy? reacted, was it really lazy?

Answer 1

你应该使用

来转义这个字符

replace(regex, "\$")

替换目标中的$有特殊含义:将匹配组放入字符串