regex

Practical Text Mining with Perl (Wiley Series on Methods and Applications in Data Mining)
$95.50
Provides readers with the methods, algorithms, and means to perform text mining tasks This book is devoted to the fundamentals of text mining using Perl, an open-source programming tool that is freely available via the Internet (www.perl.org). It covers mining ideas from several perspectives--statistics, data mining, linguistics, and information retrieval--and provides readers with the means to successfully complete text mining tasks on their own. The book begins with an introduction to regular expressions, a text pattern methodology, and quantitative text summaries, all of which are fundamental tools of analyzing text. Then, it builds upon this foundation to explore: Probability and texts, including the bag-of-words model Information retrieval techniques such as the TF-IDF similarity measure Concordance lines and corpus linguistics Multivariate techniques such as correlation, principal components analysis, and clustering Perl modules, German, and permutation tests Each chapter is devoted to a single key topic, and the author carefully and thoughtfully introduces mathematical concepts as they arise, allowing readers to learn as they go without having to refer to additional books. The inclusion of numerous exercises and worked-out examples further complements the book's student-friendly format. Practical Text Mining with Perl is ideal as a textbook for undergraduate and graduate courses in text mining and as a reference for a variety of professionals who are interested in extracting information from text documents.

Regular Expression Pocket Reference (Pocket Reference (O'Reilly))
$14.99
It is a very good guide. But I have to borrow the notes in the Vi section to use it with sed when I need to use a Regex.

A more practical guide on regex's and shell scripting would be better!

Windows Developer Power Tools: Turbocharge Windows Development with More Than 140 Free and Open Source Tools
$59.99
DISCLAIMER: I personally know both authors.

The book presents an exensive list of tools available to the .NET programmer. I agree with one of the reviewer that indicates that as soon as the book is published it is out of date; hence, some of the tools may be significantly changed or replaced by better tools. However, this problem is not unique to this book but applies to any book, particularly in technology. In spite of this obsolescence, the book provides a summary for what each tool can do and provides a starting point to do research on a tool that will help the reader perform their job more eficiently.
I highly recommend this book because it is very comprehensive. In addition it has a number of Windows tools that are also very helpful in tasks that every developer has to do but are not related to writing code.

Re-Gex #1
$4.75