- Apocalypse 5 - Regular Expressions by Larry Wall
- The Dark Side of Regular Expressions describes troubleshooting performance issues with regular expressions. The scenario is not syslog-related, but helpful nonetheless.
- Kernighan & Pike article in Dr. Dobbs' Journal: requires payment, and I'm not sure about the value for money it provides (if you've read it and would like to send me your opinion, I'll post it here).
- Mastering Regular Expressions: The O'Reilly book on regular expressions. Chapter 4, The Mechanics of Expression Processing is on-line.
- Stafford, Regular Expressions
- The Regex Coach -- an interactive tool for Linux and Windows that allows users to tune and experiment with their regular expressions
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(Bonus: Now You can download Tbird's SANS Webcast Slides)