使用match:

a.match(/\$.*?\$/g);

这将返回一个包含所有值的数组.您也可以使用

This returns an array with all the values. You can also use

a.match(/\$.*?\$/g)||[];

确保始终有一个数组，因为如果没有匹配项，则会得到null对象，该对象并不总是有用的.

to make sure that you’ve always got an array because if there’s no match you’ll get the null object which is not always useful.

正则表达式在我的答案中也得到了类似的解释:匹配任何内容(.)，任意次数(*)，尽可能少的次数(?).

The RegExp is also explained in an answer of mine to a similar question: match anything (.), any number of times (*), as few times as possible (?).

然后，您可以使用join将该数组连接为字符串:

Then you can use join to join that Array into a String:

(a.match(/\$.*?\$/g)||[]).join(',');

代码:

var a='Dear $name$, This is my number $number$. This is my address $address$ Thank you!';
var b=(a.match(/\$.*?\$/g)||[]).join(',');

输出:

"$name$,$number$,$address$"

有效地，在这种情况下，正则表达式匹配每个$，然后匹配直到下一个$的所有字符，最后匹配末尾的美元符号.如果在末尾指定g(全局)标志，则match将给出结果列表.

Effectively, in this case the regular expression matches every $ followed by anything up to the next $ and finally that dollar sign at the end. And match will give a list of results if you specify the g (global) flag at the end.

由于这是一个字符串(以及上面的正则表达式)文字，因此不会干扰jQuery的$符号.唯一重要的是用反斜杠(\$)来转义该符号，因为它在RegExp中具有特殊含义.

As this is a string (and the above a regular expression) literal, there’s no interference with jQuery’s $ symbol. The only important thing is to escape that symbol with a backslash (\$) because it has a special meaning in RegExp.