RegExp.prototype.multiline

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The multiline accessor property of RegExp instances returns whether or not the m flag is used with this regular expression.

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Description

RegExp.prototype.multiline has the value 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.

The set accessor of multiline is undefined. You cannot change this property directly.

Examples

Using multiline

js
const regex = /foo/m;

console.log(regex.multiline); // true

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-get-regexp.prototype.multiline

Browser compatibility

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See also