I have always had a hard time with regular expressions. They are very powerful and handy, but each time I needed to use them I found myself struggling a bit to get the right expression for the problem I needed to solve.
Today I found a great article from Mike Malone covering the basic stuff you should know about Regular Expressions. There's a lot more about them, but this article really cleared up the bare minimum you need to know to use them correctly.
So don't be lazy, go ahead and read it. It will be very helpful for any developer out there.