Expression testing tool

Are you a developer?Do you write and test regular expressions on the web?If yes,I'm sure you like to use and test different tools.So here is a very nice regular expression tool and library from Net Shift Media.
If you don't know what am I talking about,regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager.Regular expression is not only for programmers.If you are not a programmer, you use regular expressions in many situations just as well. They will make finding information a lot easier. You can use them in powerful search and replace operations to quickly make changes across large numbers of files.