Regular expressions are like alien gibberish to me. It is easy to understand the concept of regex and see why it is a useful to syntax to comprehend. Fully understanding how and why they work is another story. I’m working on getting on top of that learning curve. Here are a few resources that I am finding useful in this climb.

There are a lot of tools out there for evaluating regular expressions. For windows I think Expresso is a good choice. It has a 30 minute interactive tutorial and is free to download and use. It is .NET regex, but the features are close enough to E4X to be useful.

I Love Jack Daniels has MANY excellent cheat sheets, including this one for regular expressions.

There are a number of flavors of regular expressions. They are fundamentally similar, but it is good to know how they differ.

The Regular Expression resources and utilities. by Joel Hooks, unless otherwise expressly stated, is licensed under a Creative Commons Attribution 3.0 United States License.