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) |