JavaScript replace（）方法美元符号 [英] JavaScript replace() method dollar signs

问题描述

我有一个字符串，如 aman / gupta ，我想将其替换为 aman $$ gupta 并且我使用JavaScript 替换方法如下：

I have a string like aman/gupta and I want to replace it to aman$$gupta and for that I am using JavaScript replace method as follows:

a = "aman/gupta"
a = a.replace("/", "$")
// 'aman$gupta'

a = "aman/gupta"
a = a.replace("/", "$$")
// 'aman$gupta'

a = "aman/gupta"
a = a.replace("/", "$$$")
// 'aman$$gupta'

为什么是第一和第二种情况相同，当我使用 $$$ 而不是 $$ 时，我得到了预期的结果？

Why are the 1st and 2nd case identical and I get the expected result when I use $$$ instead of $$?

推荐答案

这是因为 $$ 插入 $。

因此，您需要使用：

a = "aman/gupta";
a = a.replace("/", "$$$$"); // "aman$$gupta"

---

查看以下特殊模式：

Pattern   Inserts
$$        Inserts a "$".
$&        Inserts the matched substring.
$`        Inserts the portion of the string that precedes the matched substring.
$'        Inserts the portion of the string that follows the matched substring.
$n        Where n is a non-negative integer lesser than 100, inserts the nth
            parenthesized submatch string, provided the first argument was a
            RegExp object.

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