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RegExp ?= Quantifier

A search for is" followed by " all"

Browser Support

/(?=n)/ is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:

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

Syntax

new RegExp("regexp(?=n)")

or

/regexp(?=n)/

Syntax with modifiers

new RegExp("regexp(?=n)", "g")

or simply:

/regexp(?=n)/g

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