First off, reading through perlre would be a good idea. It will introduce you to the regex world. Can someone help me with pointing to the excellent regex tutorial that is lying around on this site somewhere? I looked at Tutorials and was disappointed to not see it listed there... Anyhow, looking at perlre teach you a lot, so I suggest you start there. :)
Once you have searched through the documentation a little bit, you should post some attempts at doing this yourself. Try just putting one restriction per regex. If you do this, I'm certain we will help you improve upon it if possible. Good luck :)
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