From http://www.w3schools.com (Copyright Refsnes Data)

JavaScript RegExp i Modifier

RegExp Object Reference JavaScript RegExp Object

Definition and Usage

The i modifier is used to perform case-insensitive matching.

Syntax

new RegExp("regexp","i")

or simply:

/regexp/i

Example

Example

Do a case-insensitive search for "w3schools" in a string:

var str="Visit W3Schools";
var patt1=/w3schools/i;

The marked text below shows where the expression gets a match:

Visit W3Schools

Try it yourself »

RegExp Object Reference JavaScript RegExp Object

From http://www.w3schools.com (Copyright Refsnes Data)