Regular Expression Laboratory - Version 1.05 RXL is an assistant simple to use tool to help you learn and prepare regular expressions. If you are a developer or just concerned with text processing tasks, the Regular Expression Laboratory is a tool that you need. In fact, you felt that you need a program like this but could not formalize your needs. We have done this job for you. Now you can construct your regular expressions with much ease and test them by applying to an arbitrary text.