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regExp.multiline

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 Latest Draft (ECMA-262) The definition of 'RegExp.prototype.multiline' in that specification.	Draft

Browser compatibility

Feature	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	Yes	Yes	Yes	Yes	Yes	Yes
Prototype accessor property (ES2015)	Yes	?	38	?	Yes	Yes

Feature	Android webview	Chrome for Android	Edge mobile	Firefox for Android	Opera Android	iOS Safari	Samsung Internet
Basic support	Yes	Yes	Yes	Yes	Yes	Yes	?
Prototype accessor property (ES2015)	Yes	Yes	?	38	Yes	Yes	?

Compatibility notes

Prior to Firefox 48, a non-standard, global RegExp.multiline property existed in addition to this RegExp.prototype.multiline property. It is removed in newer versions (see bug 1219757). Use the property described on this page or the m flag instead.