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JavaScript RegExp m Modifier

Definition an Usage

The "m" modifier specifies a multiline match.

It affects the behavior of start (^) and end.

The character ^ specifies a match at the start of a string.

With the "m" set, ^ also match at the start of each line.

The character $ specifies a match at the end of a string.

With the "m" set, $ also match at the end of each line.

Example

Do a multiline search for "is" at the beginning of each line in a string:

let text = `Is this
all there
is`

let pattern = /^is/m;
Try it Yourself »

More examples at the bottom of this page!


Syntax

new RegExp("regexp", "m")

or simply:

/regexp/m

Browser Support

/regexp/m is an ES3 feature (JavaScript 1999).

It is fully supported in all browsers:

Chrome IE Edge Firefox Safari Opera
Yes Yes Yes Yes Yes Yes


Tip

The "m" modifier is case-sensitive and not global.

To perform a global, case-insensitive search, use "m" with "g" and "i".

Example

A global, multiline search for "is" at the beginning of each string line:

let text = `Is this
all there
is`

let pattern = /^is/gm;
Try it Yourself »

Example

A global, case-insensitive, multiline search for "is" at the beginning of each string line:

let text = `Is this
all there
is`

let pattern = /^is/gmi;
Try it Yourself »

Example

A global, multiline search for "is" at the end of each string line:

let text = `Is this
all there
is`

let text = "Is\nthis\nhis\n?";
let pattern = /is$/gm;
Try it Yourself »

Tip

Use the multiline property to check if the m modifier is set.

Check if the "m" modifier is set:

let pattern = /W3S/gi;
let result = pattern.multiline;
Try it Yourself »