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The multiline property indicates whether or not the "m" flag is used with the regular expression. multiline is a read-only property of an individual regular expression instance.
Property attributes of RegExp.prototype.multiline |
|
|---|---|
| Writable | no |
| Enumerable | no |
| Configurable | yes |
Description
The value of multiline is a Boolean and is true if the "m" flag was used; otherwise, false. The "m" flag indicates that a multiline input string should be treated as multiple lines. For example, if "m" is used, "^" and "$" change from matching at only the start or end of the entire string to the start or end of any line within the string.
You cannot change this property directly.
Examples
Using multiline
var regex = new RegExp('foo', 'm');
console.log(regex.multiline); // true
Specifications
| 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 2017 Draft (ECMA-262) The definition of 'RegExp.prototype.multiline' in that specification. |
Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Prototype accessor property | ? | 38 (38) | ? | ? | ? |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Prototype accessor property | ? | ? | 38.0 (38) | ? | ? | ? |
Compatibility notes
- Prior to SpiderMonkey 48 (Firefox 48 / Thunderbird 48 / SeaMonkey 2.45), a non-standard, global
RegExp.multilineproperty existed in addition to thisRegExp.prototype.multilineproperty. It is removed in newer versions (see bug 1219757). Use the property described on this page or the m flag instead.