RegExp.prototype.multiline

The multiline accessor property of {{jsxref("RegExp")}} instances returns whether or not the m flag is used with this regular expression.

{{InteractiveExample("JavaScript Demo: RegExp.prototype.multiline", "taller")}}

```js interactive-example const regex1 = /^football/; const regex2 = /^football/m;

console.log(regex1.multiline); // Expected output: false

console.log(regex2.multiline); // Expected output: true

console.log(regex1.test("rugby\nfootball")); // Expected output: false

console.log(regex2.test("rugby\nfootball")); // Expected output: true

## 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#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("RegExp.prototype.lastIndex")}}
• {{jsxref("RegExp.prototype.dotAll")}}
• {{jsxref("RegExp.prototype.global")}}
• {{jsxref("RegExp.prototype.hasIndices")}}
• {{jsxref("RegExp.prototype.ignoreCase")}}
• {{jsxref("RegExp.prototype.source")}}
• {{jsxref("RegExp.prototype.sticky")}}
• {{jsxref("RegExp.prototype.unicode")}}