regExp.multiline
regExp.multiline
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 | no |
| Enumerable | no |
| Configurable | yes |
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
使用 multiline
var regex = new RegExp('foo', 'm'
console.log(regex.multiline // true
规范
Specification | Status | Comment |
---|---|---|
ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.2. JavaScript 1.5: multiline is a property of a RegExp instance, not the RegExp object. |
ECMAScript 5.1 (ECMA-262)The definition of 'RegExp.prototype.multiline' in that specification. | Standard | |
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'RegExp.prototype.multiline' in that specification. | Standard | multiline is now a prototype accessor property rather than an instance's own data property. |
ECMAScript Latest Draft (ECMA-262)The definition of 'RegExp.prototype.multiline' in that specification. | Draft | |
浏览器兼容性
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Prototype accessor property | ? | ? | 38 (38) | ? | ? | ? |
Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Prototype accessor property | ? | ? | ? | 38.0 (38) | ? | ? | ? |