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


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

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

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


Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
multiline 1 12 1 5.5 5 1
Prototype accessor property (ES2015) 48 12 38 5.5 35 1.3
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
multiline 1 18 4 10.1 1 1.0
Prototype accessor property (ES2015) 48 48 38 35 1 5.0
multiline 0.1.100
Prototype accessor property (ES2015) 6.0.0

See also

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