The makers of the E Text Editor have produced a nice Learning Regular Expressions Video Tutorial and Cheatsheet. Although they apply regular expressions within their text editor product, there is lots of knowledge that you can transfer to your scripting/programming endeavors. I think a lot of readers of Digital Media Minute will not particularly have a use for this video tutorial but if you have tried to understand regular expressions and had difficulty doing so, I watched the first few minutes of this 16-minute video and I can vouch for its clear-cut, straightforward approach to regular expressions. They even include  an additional cheat sheet/ quick reference guide.