RegExp.prototype.multiline

概述

multiline 属性表明正则表达式是否使用了 "m" 标志。multiline 是正则表达式实例的一个只读属性。

RegExp.prototype.multiline 属性的属性特性:
writable false
enumerable false
configurable false

描述

multiline 是一个布尔对象,如果使用了 "m" 标志,则返回 true;否则,返回 false。"m" 标志意味着一个多行输入字符串被看作多行。例如,使用 "m","^" 和 "$" 将会从只匹配正则字符串的开头或结尾,变为匹配字符串中任一行的开头或结尾。

你无法直接更改此属性。

示例

例子:使用 multiline

var regex = new RegExp("foo", "m")

console.log(regex.multiline) // true

规范

Specification Status Comment
ECMAScript 3rd Edition. Implemented in JavaScript 1.2. Standard Initial definition.
JavaScript 1.5: multiline is a property of a RegExp instance, not the RegExp object.
ECMAScript 5.1 (ECMA-262)
RegExp.prototype.multiline
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
RegExp.prototype.multiline
Standard multiline is now a prototype accessor property rather than an instance's own data property.

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