作者：Dfsk刘海_368 | 来源：互联网 | 2023-09-24 17:43
篇首语：本文由编程笔记#小编为大家整理，主要介绍了JavaScript正则表达式--String.replace()变量替换的一点笔记相关的知识，希望对你有一定的参考价值。
篇首语：本文由编程笔记#小编为大家整理，主要介绍了Javascript正则表达式--String.replace()变量替换的一点笔记相关的知识，希望对你有一定的参考价值。
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var re &＃61;
/(\\w&＃43;)\\s(\\w&＃43;)/;
var str &＃61;
&＃39;John Smith&＃39;;
var newstr &＃61; str.replace(re,
&＃39;$2, $1&＃39;);
console.log(newstr);
|
$1 $2是指被括号()包起来的\\w&＃43;。
即当要使用变量替换时&＃xff0c;$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. |
| $&＃96; | 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. |
Switching words in a string
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