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.

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Property attributes of RegExp.prototype.multiline
Writable no
Enumerable no
Configurable yes


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.


Using multiline

const regex = new RegExp('foo', 'm');

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


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

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See also