如何在不影响“巴基斯坦”的情况下替换字符串中的“ is”之类的单词| 节点js

Question

如何替换Node.js中的单词，例如，如果我想将is字符串下面的单词替换为done：

He is a Pakistani and is a good person

输出仅给出：

He done a pakdonetani and done a good person代替He done a Pakistani and done a good person。我正在使用此代码：

var str = "He is a Pakistani and is a good person";
var res = str.replace(/is/g, "done");
console.log(res);

可以这样说，改为：

var res = str.replace(/ is /g, "done");

但它对于以下字符串将失败：

var str = "He is a Pakistani and a good person he is.";

为了应对这种情况，我们可以：

var res = str.replace(/ is/g, "done");

但它将失败

var str = "He is a Pakistani, and furthur added 'is a good boy'"

如果这样做：

var res = str.replace(/ is/g, "done");
var res = res.replace(/is /g,"done ");

然后在这种情况下将失败：

var str = "He is a Pakistani, and furthur added 'is a good boy and a caring boy he is'. Besides he said that he lives on an island";

因为它提供了输出：

Hedone a Pakistani, and furthur added 'done a good boy and a caring boy hedone'. Besides he said that he lives on andoneland

Answer 1

使用单词边界，并搜索模式\bis\b：

var str = "He is a Pakistani, and furthur added 'is a good boy'"
var res = str.replace(/\bis\b/g, "done");
console.log(res);