The **`ignoreCase`** property in Javascript specifies if the Regular expression will perform case-insensitive matching when comparing two strings.

The property returns `True` or `False` based on the value of the `i` attribute of #key# RegExp: Regular Expression #key# objects.



# Code
If the `i` attribute is set to `True`, the regular expression will infer "ABC" and "aBc" as the same strings.



const r1 = new RegExp('foo');
const r2 = new RegExp('bar', 'i');

console.log(r1.test('Football'));
// Returns false since ignoreCase property is not set.
// Hence it does not detect foo in Football

console.log(r2.ignoreCase);
// Returns true since ignoreCase property is set to True

console.log(r2.test('Barricade'));
// Returns true since it detects bar in Barricade by
// ignoring the case

What is ignorecase?

The ignoreCase property in JavaScript determines if regular expressions perform case-insensitive matching based on the i attribute.