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JavaScripty RegExp m Modifier

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

Browser Support

/regexp/m is an ECMAScript3 (ES3) feature.

ES3 (JavaScript 1999) is fully supported in all browsers:

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

Syntax

new RegExp("regexp", "m")

or simply:

/regexp/m

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;

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;

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;

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;

Regular Expression Search Methods

In JavaScript, a regular expression text search, can be done with different methods.

With a pattern as a regular expression, these are the most common methods:

ExampleDescription
text.match(pattern)The String method match()
text.search(pattern)The String method search()
pattern.exec(text)The RexExp method exec()
pattern.test(text)The RegExp method test()

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