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Mastering Regular Expressions: Powerful Techniques for Perl and Other Tools (Nutshell Handbooks) Paperback – January 11, 1997

ISBN-13: 978-1565922570 ISBN-10: 1565922573 Edition: 1st

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Product Details

  • Series: Nutshell Handbooks
  • Paperback: 368 pages
  • Publisher: O'Reilly Media; 1 edition (January 11, 1997)
  • Language: English
  • ISBN-10: 1565922573
  • ISBN-13: 978-1565922570
  • Product Dimensions: 9.2 x 7 x 0.8 inches
  • Shipping Weight: 1.3 pounds
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (67 customer reviews)
  • Amazon Best Sellers Rank: #953,261 in Books (See Top 100 in Books)

Editorial Reviews

Amazon.com Review

Regular expressions are a central element of UNIX utilities like egrep and programming languages such as Perl. But whether you're a UNIX user or not, you can benefit from a better understanding of regular expressions since they work with applications ranging from validating data-entry fields to manipulating information in multimegabyte text files. Mastering Regular Expressions quickly covers the basics of regular-expression syntax, then delves into the mechanics of expression-processing, common pitfalls, performance issues, and implementation-specific differences. Written in an engaging style and sprinkled with solutions to complex real-world problems, Mastering Regular Expressions offers a wealth information that you can put to immediate use.

From the Publisher

Regular expressions are a powerful tool for manipulating text and data. If you don't use them yet, you will discover in this book a whole new world of mastery over your data. If you already use them, you'll appreciate this book's unprecedented detail and breadth of coverage. If you think you know all you need to know about regular expressions, this book is a stunning eye-opener. With regular expressions, you can save yourself time and aggravation while dealing with documents, mail messages, log files -- you name it -- any type of text or data. For example, regular expressions can play a vital role in constructing a World Wide Web CGI script, which can involve text and data of all sorts. Regular expressions are not a tool in and of themselves, but are included as part of a larger utility. The classic example is grep. These days, regular expressions can be found everywhere, such as in: Scripting languages (including Perl, Tcl, awk, and Python) Editors (including Emacs, vi, and Nisus Writer) Programming environments (including Delphi and Visual C++) Specialized tools (including lex, Expect, and sed) While many of these tools originated on UNIX, they are now available for a wide variety of platforms, including DOS/Windows and MacOS, so you can use them in your home environment. Additionally, many favorite programming languages offer regular-expression libraries, so you can include support for them in your own programs, and yes, even applets. There can be certain subtle, but valuable, ways to think when you're using regular expressions, and these can be taught. Jeffrey Friedl has spent years helping people on the Net understand and use regular expressions. In this book he leads you through the steps of knowing exactly how to craft a regular expression to get the job done. Regular expressions are not used in a vacuum. In this book, a variety of tools are examined and used in an extensive array of examples. Perl, in particular, is very well represented throughout the book, with a major chapter dedicated entirely to it alone. Perl is extremely well-endowed with rich and expressive regular expressions. Yet what is power in the hands of an expert can be fraught with peril for the unwary. This book will help you navigate the minefield to becoming an expert.

Customer Reviews

This is a book that you will come back to many times.
W. Gage
It covers them in a way that is easy to understand and yet guides you through the complexity of this powerful tool.
Nathan Mccoy
Chapter 5 deals with writing efficient regular expressions for NFA engines.
"sherzodr"

Most Helpful Customer Reviews

137 of 147 people found the following review helpful By "sherzodr" on December 8, 2001
Format: Paperback
Jeffrey Friedl's "Matering Regular Expressions" does a facinating job in taking you through the jungle (and I mean jungle) of RegExp.
I am a Perl/CGI programmer, and I had considered myself good at RegExp even before I read this book. Most of the things I knew were from Programming Perl, 3rd edition (chapter 5, Pattern Matching). But I still decided to give Jeffrey a chance since I was having some trouble with my Parse::Syntax module, which is designed to parsing *any* programming language and highlighting the syntax accordingly (provided it has a syntax/grammer file written for the specific language). The accuracy of the parser (and more importantly the speed) does depend on well crafted regular expressions.
As I started reading the book, I couldn't stop. I took it to my school's cafeteria with me and no one could make me leave untill I finished the whole book. I was excited. I was pleased! Here is the outline of tha chapters:
Chapter 1 and 2 introduce you to regular expressions and give some basic regex examples. Mail utility and date matching is two of them.
Chapter 3 mostly talks about conventions that all the regex tools follow and their differences.
Chapter 4 deals with Traditional NFA, POSIX NFA and DFA regex engines and their pros and cons. What you'll like the most is the details provided by the author on each and every single example. He also uses a lot of step-by-step illustrations to take you deeper into the regex engine itself and see/feel how it works. He shows the point of backtrackings and provides awesome benchmarks. He uses such examples of matching a quote, allowing escaped quotes inside the pattern, matching C-style comments, IP addresses and many more.
Chapter 5 deals with writing efficient regular expressions for NFA engines.
Read more ›
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48 of 49 people found the following review helpful By Alfred Anzlovar on May 3, 2001
Format: Paperback
I got Mastering Regular Expressions in 1998 and I peek back regularly and it am proud to say is one of most used and useful books I own.
Regular expressions are for everyone. They are simple to write and can be close to impossible to read and even unimaginably harder to understand. But reading comes after you can craft one.
And this art of crafting RE is explained in astonishing detail and analysis in this book. Reader is carefully guided through basics, differences and common and uncommon pitfalls. Some of the parts are definitely not for the faint hearted! And this is especially true for parts that cover Perl RE. While main topic is Perl RE engine, a deep-enough travel through different RE dialects is made to help RE-crafting in almost any tool that supports REs.
I've used the methods described in the book in tools as different as MS VC++, various editors, search engines and programming (Perl, PHP, C++, ...). The ability to use RE usually impressed people to the point they were sure I am using some incredible magic.
But I must say that the most useful feature delivered in this book was ability to PARSE, UNDERSTAND and FIX a (slow, broken, strange acting) RE. This can be slowly absorbed by reader's (open) mind while carefully reading the book. The difference between meant/written can be as extreme as it can get in RE. I can (proudly) say I've been able to fix several complex REs, by simply (one could say blindly) following the rules laid in the book.
My opinion is thath without this book real understanding of RE is almost impossible. I recommended it all of those who use programs that support (any form) of RE engine. It will help them solve some (hard) problems incredibly fast!
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23 of 24 people found the following review helpful By W. Gage on March 7, 2002
Format: Paperback
I can't say enough good things about this book.
Regular expressions are such a powerful concept, but some of that power would be easy to miss if not guided correctly through the topic. Jeffrey Freidl does a great job of making a potentially very dry subject interesting, even while getting very involved in all the complexities that are inherent in such a powerful abstraction. He also does a good job of presenting both the general topic of regular expressions and the specific characteristics of the various tools available to process them.
This is a book that you will come back to many times. I actually read it as a precursor to learning Perl several years ago. Then just recently I revisited it while taking a class on compiler construction and found that it still had useful insights for me. If you're a committed programmer, this book should be on your shelf.
Also, the criticisms I've read in reviews here are pretty misguided. It is "chatty", because the author has a genuine enthusiasm for his subject. It is also not a "teach yourself regular expressions in 24 hours" kind of book. There are actually lots of cookbook style examples, but the main point of the book is to give you a solid enough understanding of the general topic that you don't need examples to craft your regexes. In this case, little patience as a reader will be much rewarded.
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33 of 37 people found the following review helpful By A Customer on February 7, 1998
Format: Paperback
I made the mistake of buying a bunch of books on Perl to try to learn Perl programming. I made progress, but it was slow -- and it beat me down. Then I bought THIS book. Perl's implementation of Regular Expressions is a great deal of the functionality of that language. This is true to the extent that trying to read Perl script without knowing Regular Expressions is tedious at best. This is not just another computer book. Jeffrey Friedl has put his heart and soul into this work, and it shows. He even offers free updates (in the truest, most honest sense of the word) from his own web page. This is the best programming book I own.
After reading this book, Perl script reads like USA Today! Save yourself lots of heartache. Buy this book, Mastering Regular Expressions -- read it -- THEN learn Perl!
Jeff Morris
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