Customer Reviews

Regular Expression Pocket Reference

5 star:		(13)
4 star:		(14)
3 star:		(4)
2 star:		(2)
1 star:		(0)

 

 

One of the most difficult things when working with regular expressoins -- at least for me -- is dealing with different implementations (i.e., Perl, Java, Python, PHP, UNIX tools, etc.) The basics of regexes and pattern matching don't vary all that much, but each implementation is just different enough that the smae line of code can yield different results. If you work with more than one of these implementations, keeping track of differences in metacharacters and metasequences can be nearly impossible. This is especially true when -- as is the case with me -- you deal with regexes somewhat intermittently.

This is one of the main reasons why the "Regular Expression Pocket Reference"
was written and this is why I keep it close at hand. This book will not really teach you how to use regexes, nor will it tell you how to use, say, Perl. If, however, you use Perl and you know how to use regexes but just can't remember whether you can disallow backtracking for text matched by a subpattern, then this book will save you quite a bit of time and effort.

If you're wondering what it means to "disallow backtracking for text matched by a subpattern," or when you would want to use it, buy "Mastering Regular Expressions" or a similar title. The "Regular Expression Pocket Reference" is designed to be a quick reference tool, and it serves this purpose very well. I would recommend it especially for those who work with regular expressions intermittently or who work with several different implementations.

I love this series of books (the C#, C++ and STL pocket refs are my favorite), but the Regular Expression pocket ref tries to cover too many implementations. You only get about 10 pages for each language so, unless you use multiple implementations (e.g. C#/.NET, Perl, JavaScript, etc), this just isn't good value for money. I returned my copy and printed out a quick reference from one of the many Internet programming sites.

The editorial blurb on this book suggests that it can be used as a tutorial by those new to regular expressions. That's not the case. This book is strictly a reference, albeit a very good one. I bought O'Reilly's "Mastering Regular Expressions" to learn the area, and I use this book as a quick reference. It serves that purpose very well.

It's nearly impossible to memorize all the minutiae of regular expressions, especially over multiple language implementations. Tony Stubblebine's book Regular Expression Pocket Reference by O'Reilly is a nice way to help you out without digging through endless pages.

Chapter List: About This Book; Introduction To Regexes And Pattern Matching; Perl 5.8; Java (java.util.regex); .NET And C#; Python; PCRE Lib; PHP; vi Editor; JavaScript; Shell Tools; Index

Like most pocket references, this book is small (93 pages), but there's a lot of information packed into a small space. Each implementation chapter covers the metacharacters and metasequences that are supported in the language's implementation of regular expressions. This is followed by the language functions, examples of regular expressions, and a list of additional resources the reader can use to learn more about regular expressions in that language. If you don't know anything about the subject, this book (in my opinion) isn't going to help you out much. It assumes that you already understand the material and you're looking for a reference guide to find quick answers. And that's fine. This book has a definite purpose and target audience, and I think it does a very nice job of hitting the mark.

For me, this would be a perfect companion book to Mastering Regular Expressions (also by O'Reilly). Mastering is considered one of the definitive volumes on the subject, and having this pocket guide on hand to jog your memory on lesser-used points would be perfect.

I recommend getting this book
if you feel comfortable with regular expressions
and regular expressions are important to you.

As one expects from an O'Reilly Pocket Reference,
this book is compact but still covers a lot of ground.
For a whole bunch of applications, it provides:
* tables of various groupings of regex metacharacters,
summarizing their syntax and meaning;
* summaries of other regex related features,
but not in tabular form;
* examples;
* a few references in case you need to go deeper.

The information is concise and well chosen.

This is a reference,
but in applications where you use regular expressions less,
it may also be useful for expanding your knowledge significantly.
It was for me.

If you wish, take a look at my
more detailed review on Oakland Perl Mongers.

This is not a learning text by any stretch of the imagination. Covering the basic implementation of Regular Expressions in Perl, Java, .NET, C#, Python, PCRE, PHP, vi Editor, JavaScript, and a few shell utilities, this title is well suited as a quick "cheat sheet" for those already familiar, often providing the required information in just the "Supported Metacharacters" section.

Although around 90 (small) pages, the book repeats the same 8-page sequence for each of the aforementioned languages, tweaked as needed. Although handy for those that regularly use multiple languages, the book's format could have been made more efficient.

Those looking for just an as-needed reminder, this title meets your needs. For those looking to learn Regular Expressions, Mastering Regular Expressions (3rd Edition) by Jeffrey Friedl (ISBN: 0596528124) is where you should start.

I'm scared of regular expressions. They vex me constantly at work whether trying to figure out someone else's Apache RewriteRules or Perl or just trying myself to do mildly clever things in vi and sed. They are a headache.

A coworker let me browse his copy of this wonderful little book and I was hooked. I actually tried to buy one that day on the way home, but they were out of stock and so I permitted Amazon to ship me one.

In addition to brief explanations of the different types of regexes in the wild (based on the comprehensive Mastering title, also from ORA), there are detailed quick references to all of the different implementations including several common languages (Perl, PHP, C#, and several others) and software packages (including sed, Apache, vi and many others). All of their various quicks and "features" are explained briefly and there are some examples.

No one hacking around in Unix or doing much programming should be without this book, unless they are already a regex wizard, and I think even they'd find it handy.

Pocket references are not meant to teach you anything from the beginning, but to be everyday references in known and new environments. In other words, if you don't know regular expressions, then go to "Mastering Regular Expressions". If you're still here, then you'll get a cheat sheet on steroids for languages ranging from bug-prone JavaScript to the King and Queen of robustness, Perl and Python. Although everything claims to be PCRE these days, particular examples in every language available is a plus for anyone. A must for any type of user input validation.

This is a handy little guide for common regular expression fundamentals and odds and ends. The intro chapter does a nice job of giving you the regex elevator speech and hits all the important fundamentals: different engines, metacharacters, and general pattern rules. There's also a regex "Cookbook" section; however, that bit is only two pages and the "recipes" there are so rudimentary that they're nearly useless and would have been better left to a different book.

The remaining chapters hit regex support in major languages, Apache, shells, and Vi and Vim editors. These sections are very well done and give you great guidance to regex implementations on that platform, plus give you guidance on the APIs you'll need for working with regexes. Languages covered include Perl 5.8, Java 1.5/1.6, .NET framework with examples in C#, PHP, Python, Ruby, Python and JavaScript. The Perl Compatible Regular Expression library (PCRE) is also covered.

Each chapter is concise, well-written and hits the major things you'll need to refresh your memory on from time to time.

Overall it's a very well done book.

I've been programming with perl for seven years. I've always found it cumbersome trying to remember everything that regular expressions have to offer. Since I have purchased Regular Expression Pocket Reference I no longer have this problem. This book has been a tremendous help to me in utilizing the true power of regular expressions.
The explanations and examples are exceptionally clear and easy to comprehend. The book has improved my programming capabilities while making my job easier. I highly recommend this book to anyone who is required to use regular expressions or to the newbie who wants to learn how.