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This is the BSDA Study Guide Book written via a wiki collaboration. This is a work in progress. You may contribute to or discuss this specific page at http://bsdwiki.reedmedia.net/wiki/Demonstrate_proficiency_with_regular_expressions.html. Demonstrate proficiency with regular expressions Concept Regular expressions are part of the daily life of a system administrator. Be able to match text patterns when analyzing program output or searching through files. Be able to specify a range of characters within brackets [], specify a literal, use a repetition operator, recognize a metacharacter and create an inverse filter. Introduction Examples Practice Exercises More information grep(1), egrep(1), fgrep(1), re_format(7)