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Parsing with Perl 6 Regexes and Grammars: A Recursive Descent into Parsing 1st ed. Edition

by Moritz Lenz (Author)

5.0 20 ratings

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Write good regexes and parsers with the Perl 6 programming language. You’ll see how regexes are used for searching, parsing, and validation: in particular the grammar extension makes them uniquely suitable for parsing, the main focus of this book. Written by Perl 6 expert Moritz Lenz, a core contributor of Rakudo, Parsing with Perl 6 Regexes and Grammars starts from the very basics of regular expressions, and then explores how they integrate with regular Perl 6 code. Then follows a deeper exploration of how regexes work under the hood and a discussion of common techniques for constructing regexes and exploring the data under scrutiny. Later material goes beyond relatively simple formats to reusable named regexes and grammars, which permit code reuse in grammars, and shows how to write parsers for more involved data formats. Error reporting and case studies wrap up the topic.
While regexes allow you to search for patterns in text and validate input, Perl 6 regexes advance that concept: you’ll see how they are easier to read, yet much more powerful, than the traditional "Perl-compatible regular expression". With improved reusability and backtracking control, you will be able to write complete parsers with the help of this book.
What You'll Learn

Discover the building blocks of Perl 6 regexes
Handle regex mechanics and master useful regex techniques
Extract data and work with patterns among these use cases
Reuse named regexes and other grammars as components or templates
Write full parsers, including advanced error reporting and data extraction
Learn how to parse nested scopes and indention-based formats

Who This Book Is For
Those with at least some prior experience with Perl programming, but who may be new to Perl 6 as well as searching and parsing.

From the Back Cover

Write good regexes and parsers with the Perl 6 programming language. You’ll see how regexes are used for searching, parsing, and validation: in particular the grammar extension makes them uniquely suitable for parsing, the main focus of this book. Written by Perl 6 expert Moritz Lenz, a core contributor of Rakudo, Parsing with Perl 6 Regexes and Grammars starts from the very basics of regular expressions, and then explores how they integrate with regular Perl 6 code. Then follows a deeper exploration of how regexes work under the hood and a discussion of common techniques for constructing regexes and exploring the data under scrutiny. Later material goes beyond relatively simple formats to reusable named regexes and grammars, which permit code reuse in grammars, and shows how to write parsers for more involved data formats. Error reporting and case studies wrap up the topic.
While regexes allow you to search for patterns in text and validate input, Perl 6 regexes advance that concept: you’ll see how they are easier to read, yet much more powerful, than the traditional "Perl-compatible regular expression". With improved reusability and backtracking control, you will be able to write complete parsers with the help of this book.
You will:

Discover the building blocks of Perl 6 regexes
Handle regex mechanics and master useful regex techniques
Extract data and work with patterns among these use cases
Reuse named regexes and other grammars as components or templates
Write full parsers, including advanced error reporting and data extraction
Learn how to parse nested scopes and indention-based formats

About the Author

Moritz Lenz is a software engineer and architect. In the Perl community, he is well known for his contributions to the Perl 6 programming language, the Rakudo Perl 6 compiler, related test suite, infrastructure and tools. At his employer, noris network AG, he introduced continuous delivery for many in-house developed applications, and now wants to share his experience with the wider world.

ISBN-10

1484232275
ISBN-13

978-1484232279
Edition

1st ed.
Publisher

Apress
Publication date

December 11, 2017
Language

English
Dimensions

6.1 x 0.52 x 9.25 inches
Print length

215 pages
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1
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Product details

Publisher ‏ : ‎ Apress; 1st ed. edition (December 11, 2017)
Language ‏ : ‎ English
Paperback ‏ : ‎ 215 pages
ISBN-10 ‏ : ‎ 1484232275
ISBN-13 ‏ : ‎ 978-1484232279
Item Weight ‏ : ‎ 1.02 pounds
Dimensions ‏ : ‎ 6.1 x 0.52 x 9.25 inches

Best Sellers Rank: #3,777,158 in Books (See Top 100 in Books)
- #140 in Perl Programming
- #348 in Object-Oriented Software Design
- #540 in Unix Operating System

Customer Reviews:
5.0 20 ratings

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Laurent Rosenfeld

The book I wished I had, the book that you can now have

Reviewed in the United States on December 8, 2017

I have been interested with Perl 6 for quite a few years by now. I wrote several tutorials in French on this programming language over the last years (including one specifically on regexes and grammars), and I am also the author of the Think Perl 6 book (in English, published in May of this year by O'Reilly). In my humble opinion, the ability to create and use grammars is one of the finest features of Perl 6, just like regexes was the killer feature of Perl 5 many years ago, something that many people heavily criticized at the beginning as "line noise," but something that has proven so successful that most modern programming languages have imitated it by including support for the "Perl-Compatible Regular Expressions" (PCRE) library. I believe that Perl 6's support for grammars is one of the hot features that may well make Perl 6 the programming language of reference for the next 20 or 30 years.

When I started to learn Perl 6 grammars about four years ago, it was sometimes quite difficult for me, because the documentation was relatively sparse and scattered in various places. I really wished that I had the opportunity to have a good book on Perl 6 grammars, but there was none at the time. Now, this book exists, this is "Parsing with Perl 6 Regexes and Grammars," by Moritz Lenz, and this is not simply a good book on grammars, this is a truly excellent book. This is really the exact book that I would have wished to have when I started, and even long after I started.

I have read thoroughly a beta-version of that book in September of this year (being one of the technical reviewers), and I can only say that the author really made an absolutely superb job. The book is very clear, and yet covers thoroughly everything there is to know about Perl 6 grammars, including some of the somewhat arcane details that could become a showstopper to persons not used to the grammar paradigm. With this book, you're really ready to go.

I have received the final version (in electronic format) only two days ago and haven't gone through it in detail yet, but I noticed that Moritz Lenz's book now has 90 more pages. I did not have time yet to read this new, final version in detail yet, but from what I saw going through it, I am sure that it is an even better book than the one I read about three months ago.

Thank you very much, Moritz, in my name and in the name of the whole community, for making this excellent book available. Again, this is exactly the book I would have wished to have when I started to work on Perl 6 grammars, and I can only very warmly recommend everyone interested with the subject to get hold of it.

And, by the way, although I have both the beta electronic version of three months ago and the final electronic version that was just issued, I ordered a few weeks ago the printed version, as this is really a book I want to have on my desk next to my computer whenever I am using grammars. I believe you should do the same.

9 people found this helpful

Helpful

dont give in to peer pressure

This book got me to the next level! Raku grammars for the win! Thank you Moritz!!

Reviewed in the United States on January 23, 2022

super helpful book and author! Moritz spent two hours or so across a few separate occasions helping me with my code! The information he provides in this book is actually a game changer.

Before reading his book, I had read the whole Raku docs through *once* before much exposure to the language. Then, I spent a few months with it, writing Raku daily for various scripting tasks. I was starting to get the hang of grammars when I picked up this book.

What it did for me was to show me a few dozen more techniques than I knew before -- I now use many of these techniques daily. Moritz's book went beyond the docs to really show specifically how to put some of the less obvious grammar features into practice on real tasks.

Plus, he was available to answer a few specific questions I had on IRC/discord -- it made my day!

Thank you Moritz! Looking forward to reading more from you!

One person found this helpful

Helpful

rir

Great book

Reviewed in the United States on January 21, 2022

"Make the difficult easy" is what this book does.

If you have an interest in the subject, get this book. It is an accessible how-to that scales to a broad range of ability.

If you can write code in any modern general purpose language, know what 'parsing' and 'compiling' mean, and used some textual pattern matching or regular expressions, then this book will get you going. If you are missing one of the above abilities, you just can't skim over the start of the book.

If you know you are capable of writing a compiler with all the bells and whistles
then this will show you a state of the art tool designed to get it done quickly. It demonstrates how to handle errors, reference the offending input, and other finishing touches.

One person found this helpful

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Arderath

Excellent introduction to raku regex and grammars

Reviewed in the United States on October 11, 2020

This book is an excellent introduction and reference manual to raku (formerly perl 6) regexes and grammars. It explains the new and powerful features that raku brings to the table when compared to other languages such as perl. In particular, it introduces "grammars" which is a syntax that leverages regexes to parse text. Coming from perl grammars are a strange new construct, at the same time familiar (since it looks a lot like raku classes) and completely new. The book introduces them in an understandable and succinct way and allowed me to learn and get to grips with the feature. While the book focuses on explaining both regexes and grammars from the ground up, it manages to never talk down to the reader. I'd highly recommend this book to anyone starting out with raku, or seasoned raku programmers that want to learn how to properly leverage regexes and grammars. An excellent book that I no doubt will be using as a reference book well beyond the initial read.

One person found this helpful

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Brian Duggan

An essential guide to new tools and new parsing methodologies. Prevents head injury.

Reviewed in the United States on December 10, 2017

Just as Perl 5 was a game-changer for regular expressions, Perl 6 has brought new programming paradigms with its grammars.

The copious examples of real-world situations in this book, along with the solid explanations, make me wonder how I managed to do parsing beforehand (and make me realize why I tried to avoid it). Perl 5 was once called the sound of people not banging their heads against a wall -- this book evokes a similar sentiment, though this time the wall is lex and yacc, or trying to push regexes beyond their limits. The simple yet thorough explanations of the techniques in this book have already become an invaluable part of my programming toolkit and my problem solving. I also found that the format is clear and approachable, with new insights and techniques for all levels of programmers.

8 people found this helpful

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Andrew Fresh

Gave me a grasp of what perl6 grammars actually are.

Reviewed in the United States on April 17, 2018

I initially had some trouble understanding why I'd want to use grammars, but this book really made it clear what they're good for and what makes them a good way of thinking about parsing. As a side effect I now understand perl6 regexes much better than I did previously.

3 people found this helpful

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abbypan

awesome work

Reviewed in the United States on December 9, 2017

It is very helpful.

Perl 6 has done much improvement on PCRE, this book shows these amazing features.

Grammar description and sample case are graceful.

4 people found this helpful

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Gregory C. Donald

Concise and valuable.

Reviewed in the United States on August 17, 2019

Everything you want in a book with the given title.

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Víctor R. Escobar Olmos

A curated resource with actual value

Reviewed in Germany on July 3, 2021

Verified Purchase

Ideal for the job, you will get more benefit if you already can program Raku or Perl to some extent and apply the lessons to whatever problem you need to solve. Completely recommended for its own topic.

Luca Ferrari

A must have book

Reviewed in Italy on January 14, 2018

Verified Purchase

A very well written book, it does explain a lot of Perl 6 regexeps and also other more general concepts like what a parser is.

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Christian BELOSCAR

Indispensable

Reviewed in France on January 24, 2018

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Pour tout savoir ou presque sur les grammaires de Perl 6,
une approche à la fois simple et compréhensible malgré la difficulté
du sujet traité. Je conseille (livre en anglais).

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Simon P.

Must read for the Perl6 programmer.

Reviewed in the United Kingdom on January 10, 2018

Verified Purchase

I've been interested in Perl6 for a while now but have found the Grammars system complex and hard to get into. This book provides a great breakdown of how regexs and grammars work in Perl6 building up from simple examples to more complex use cases.

Definitely recommended for anyone looking to learn Perl6.

Laurent Rosenfeld

The book you need to have if you're interested in Perl 6 grammars

Reviewed in France on February 1, 2018

Verified Purchase

Absolutely excellent book. Really recommended if you have any interest in regexes and grammars in the Perl 6 language. A must.

One person found this helpful

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