Author: [Jeffrey E. F. Friedl]

WWW book information: http://www.oreilly.com/catalog/regex/

More book information: http://enterprise.ic.gc.ca/%7Ejfriedl/regex/

This book explains [regular expressions] in general, and then covers a number of different tools explaining specialized variations.  The book focuses more on [Perl], but Tcl is one of the tools covered in its own special section. And more...

A second edition of this book is now available, and Tcl continues to be covered in it.

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[regexp] - [regsub]
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There is a helpful errata section for this book on O'Reilly's site at: http://public.yahoo.com/~jfriedl/regex/errata.html
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The second edition praises Tcl's regular expression engine: ''Henry's Tcl regex engine is an important step forward.''

Also, in Chapter 6: Crafting and 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 chapter.
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[Category Book]