6.1. The TextField

The Ext TextField adds features to the existing HTML input field such as basic validations, a custom validation method, automatic resizing, and keyboard filtering. To utilize some of the more powerful features such as keyboard filters (masks) and automatic character stripping, you’ll need to know a little about regular expressions.

Learn more about regex with JavaScript If you’re new to regular expressions, there’s a plethora of information on the internet. One of my favorite sites to learn about this topic is http://www.regular-expressions.info/javascript.html.