Hone Your Regexp (Regular Expression) Pattern-Building Skills
http://www.ibm.com/developerworks/aix/library/au-expressions.html

Stutz, Michael
IBM
2006

Abstract:

Add to your bag of tricks several handy techniques for crafting real-world regular expressions (regexps). Building regexps is a part of the daily life of any administrator. Learning to think in terms of pattern matching, in order to construct successful regexps that return the desired criteria, is a skill that takes both time and practice.