I will be giving a presentation on Regular Expressions at BayLISA in Cupertino on April 21. Come out and see it! Here are the details: Whether running a simple grep command or writing a big Perl program, a thorough understanding of regular expressions is an essential skill for any system administrator. The talk will describe the history, syntax, and best practices for regular expressions; how a well-written regular expression can dramatically improve the speed of pattern matching; and give tips for using regular expressions in Perl programs.