RegExp.prototype.multiline - JavaScript 编辑

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.

浏览器兼容性

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Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

相关链接

• RegExp.prototype.global
• RegExp.prototype.lastIndex
• RegExp.prototype.ignoreCase
• RegExp.prototype.source
• RegExp.prototype.sticky