JavaScript RegExp ? 量词

定义和用法

n? 量词匹配包含零次或一次出现的 n 的任何字符串。

实例

全局搜索 "1" ，后跟零个或一个 "0" 字符：

let text = "1, 100 or 1000?";
let pattern = /10?/g;

亲自试一试

语法

new RegExp("n")

Or abbreviated as:

/n?/

语法修饰符

new RegExp("nQuery "g")

Or abbreviated as:

/n?/g

Browser support

/n?/ Is ECMAScript1 (ES1) feature.

All browsers fully support ES1 (JavaScript 1997):

Chrome IE Edge Firefox Safari Opera
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