A colleague of mine wants to learn about regexes. I can teach him the basics no problem, but I think such an introduction should include more than just the syntax. Issues I deem important include

• When not to use regexes (e.g. use split for /etc/passwd-like files)
• What to avoid (e.g. Death to Dot Star!)
• How to make regexes more readable (e.g. How can I hope to use regular expressions without creating illegible and unmaintainable code?)

So before I go and reinvent the wheel poorly, is there a good introduction to regexes available that covers usage aspects as well?

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