Web/JavaScript/Reference/Global objects/RegExp/ignoreCase

The ignoreCase property indicates whether or not the "i" flag is used with the regular expression. ignoreCase is a read-only property of an individual regular expression instance.

Property attributes of `RegExp.prototype.ignoreCase`
Writable	no
Enumerable	no
Configurable	yes

Description

The value of ignoreCase is a Boolean and true if the "i" flag was used; otherwise, false. The "i" flag indicates that case should be ignored while attempting a match in a string.

You cannot change this property directly.

Examples

Using ignoreCase

var regex = new RegExp('foo', 'i');

console.log(regex.ignoreCase); // true

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'RegExp.prototype.ignoreCase' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`ignoreCase`	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 5.5	Opera Full support 5	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Prototype accessor property (ES2015)	Chrome Full support 48	Edge Full support 12	Firefox Full support 38	IE Full support 5.5	Opera Full support 35	Safari Full support 1.3	WebView Android Full support 48	Chrome Android Full support 48	Firefox Android Full support 38	Opera Android Full support 35	Safari iOS Full support 1	Samsung Internet Android Full support 5.0	nodejs Full support 6.0.0

Legend

Full support: Full support