JavaScript Check for case insensitive values?

To check for case insensitive values, use regular expression in JavaScript. Following is the code −

Example

var allNames = ['john','John','JOHN'];
var makeRegularExpression = new RegExp(allNames.join( "|" ), "i");
var hasValue = makeRegularExpression.test("JOHN");
console.log("Is Present="+hasValue);

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo130.js.

Output

This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo130.js
Is Present=true