查找子字符串并插入另一个字符串 [英] Finding a substring and inserting another string

问题描述

假设我有一个变量，字符串的长度没有固定，有时像

Suppose I have a variable that the the length of string is not fixed, sometimes like

var a = xxxxxxxxhelloxxxxxxxx;

有时像

var a = xxxxhelloxxxx;

我不能使用 substr（）因为位置不一样。

I can't use substr() because the position is not identical.

如何在字符串中找到字符串hello并在hello之后插入一个字符串world？
（欢迎使用JavaScript或jQuery方法）

How can I found the string "hello" in the string and insert a string "world" after "hello"? (method in JavaScript or jQuery are welcomed)

谢谢

推荐答案

var a = "xxxxhelloxxxxhelloxxxx";
a = a.replace(/hello/g,"hello world"); // if you want all the "hello"'s in the string to be replaced
document.getElementById("regex").textContent = a;

a = "xxxxhelloxxxxhelloxxxx";
a = a.replace("hello","hello world"); // if you want only the first occurrence of "hello" to be replaced
document.getElementById("string").textContent = a;

<p>With regex: <strong id="regex"></strong></p>
<p>With string: <strong id="string"></strong></p>

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