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1
2
3
4
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var re =
/(\w+)\s(\w+)/;
var str =
'John Smith';
var newstr = str.replace(re,
'$2, $1');
console.log(newstr);
// Smith, John
|
$1 $2是指被括号()包起来的\w+。
即当要使用变量替换时，$n指第n个用()包起来的表达式的值。
要用()包起来呀…‘(>﹏<)′ ‘(>﹏<)′
Specifying a string as a parameter
The replacement string can include the following special replacement patterns:
| 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. |