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.

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	Status	Comment
ECMAScript 3rd Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.2. JavaScript 1.5: ignoreCase is a property of a RegExp instance, not the RegExp object.
ECMAScript 5.1 (ECMA-262) The definition of 'RegExp.prototype.ignoreCase' in that specification.	Standard
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'RegExp.prototype.ignoreCase' in that specification.	Standard	ignoreCase is now a prototype accessor property rather than an instance's own data property.
ECMAScript 2017 Draft (ECMA-262) The definition of 'RegExp.prototype.ignoreCase' in that specification.	Draft

Browser compatibility

See also

• RegExp.lastIndex
• RegExp.prototype.global
• RegExp.prototype.multiline
• RegExp.prototype.source
• RegExp.prototype.sticky