Author: [Jeffrey E. F. Friedl]

WWW book information:
   * First edition: http://www.oreilly.com/catalog/regex/
   * Second edition: http://www.oreilly.com/catalog/regex2/

More book information: http://enterprise.ic.gc.ca/%7Ejfriedl/regex/ ''(may not be working)''

Author's Web site: http://regex.info/

This book explains [regular expressions] in general, and then covers a number of different tools explaining ----

The second edition [http://oreilly.com/catalog/regex2/] praises Tcl's regular expression engine: ''Henry's Tcl regex engine is an important step forward.''

Also, in Chapter 6: Crafting an Efficient Expression, Friedl says: ''Most of what this chapter talks about simply does not apply to Tcl.'' And, as the sidebar explains, Henry Spencer's Tcl regex is a hybrid DFA/NFA engine and it doesn't need most of the optimizations described in the 
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[Category Book]