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Update regex.md
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@ -376,7 +376,7 @@ JavaScript 语言的正则表达式，只支持先行断言（lookahead）和先
```javascript ```javascript
/(?<=\$)\d+/.exec('Benjamin Franklin is on the $100 bill') // ["100"] /(?<=\$)\d+/.exec('Benjamin Franklin is on the $100 bill') // ["100"]
/(?<!\$)\d+/.exec('it’s is worth about €90') // ["90"] /(?<!\$)\d+/.exec('it’s worth about €90') // ["90"]
``` ```
上面的例子中，“后行断言”的括号之中的部分（`(?<=\$)`），也是不计入返回结果。 上面的例子中，“后行断言”的括号之中的部分（`(?<=\$)`），也是不计入返回结果。