Many people think that learning to use Regular Expressions is difficult, but if you stick to the basics it is actually quite easy. This screencast and cheatsheet will give you a gentle introduction and allow you to gradually expand your knowledge into advanced usage.
Nothing can improve your ability to manipulate text as much as learning Regular Expressions, and it is not just in your editor. Just about any modern programming language support them, so you can greatly enhance your productivity and understanding of code by learning them.
The following screencast gives an introduction to the basics of regular expressions and shows how you can use them in your editor. The best way to learn is just playing around with them and watching the interactive feedback.