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 | 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 Latest Draft (ECMA-262) The definition of 'RegExp.prototype.ignoreCase' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | Yes | Yes | Yes | Yes | Yes | Yes |
Prototype accessor property (ES2015) | Yes | ? | 38 | ? | Yes | Yes |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Prototype accessor property (ES2015) | Yes | Yes | ? | 38 | ? | Yes | Yes |