用多个其他字符串替换多个字符串

Question

我正在尝试用多个其他单词替换字符串中的多个单词。绳子是“我有一只猫，一只狗，和一只山羊。”

然而，这并不产生“我有一只狗，一只山羊，一只猫”，而是产生“我有一只猫，一只猫，一只猫”。是否可以在JavaScript中同时用多个其他字符串替换多个字符串，从而产生正确的结果？

var str = "I have a cat, a dog, and a goat.";
str = str.replace(/cat/gi, "dog");
str = str.replace(/dog/gi, "goat");
str = str.replace(/goat/gi, "cat");

//this produces "I have a cat, a cat, and a cat"
//but I wanted to produce the string "I have a dog, a goat, and a cat".

Answer 1

您可以使用一个函数来替换每一个。

var str = "I have a cat, a dog, and a goat.";
var mapObj = {
   cat:"dog",
   dog:"goat",
   goat:"cat"
};
str = str.replace(/cat|dog|goat/gi, function(matched){
  return mapObj[matched];
});

jsfiddle示例

如果您希望动态维护regex并将将来的交换添加到映射中，可以这样做

new RegExp(Object.keys(mapObj).join("|"),"gi"); 

var mapObj = {cat:"dog",dog:"goat",goat:"cat"};

var re = new RegExp(Object.keys(mapObj).join("|"),"gi");
str = str.replace(re, function(matched){
  return mapObj[matched];
});

function replaceAll(str,mapObj){
    var re = new RegExp(Object.keys(mapObj).join("|"),"gi");

    return str.replace(re, function(matched){
        return mapObj[matched.toLowerCase()];
    });
}