regular expression pdf

Take the guesswork out of using regular expressions. With more than 140 practical recipes, this cookbook provides everything you need to solve a wide range of real-world problems. Novices will learn basic skills and tools, and programmers and experienced users will find a wealth of detail. Each recipe provides samples you can use right away.

This revised edition covers the regular expression flavors used by C#, Java, JavaScript, Perl, PHP, Python, Ruby, and VB.NET. You’ll learn powerful new tricks, avoid flavor-specific gotchas, and save valuable time with this huge library of practical solutions.

• Learn regular expressions basics through a detailed tutorial
• Use code listings to implement regular expressions with your language of choice
• Understand how regular expressions differ from language to language
• Handle common user input with recipes for validation and formatting
• Find and manipulate words, special characters, and lines of text
• Detect integers, floating-point numbers, and other numerical formats
• Parse source code and process log files
• Use regular expressions in URLs, paths, and IP addresses
• Manipulate HTML, XML, and data exchange formats
• Discover little-known regular expression tricks and techniques

If you’re a programmer new to regular expressions, this easy-to-follow guide is a great place to start. You’ll learn the fundamentals step-by-step with the help of numerous examples, discovering first-hand how to match, extract, and transform text by matching specific words, characters, and patterns.

Regular expressions are an essential part of a programmer’s toolkit, available in various Unix utlilities as well as programming languages such as Perl, Java, JavaScript, and C#. When you’ve finished this book, you’ll be familiar with the most commonly used syntax in regular expressions, and you’ll understand how using them will save you considerable time.

• Discover what regular expressions are and how they work
• Learn many of the differences between regular expressions used with command-line tools and in various programming languages
• Apply simple methods for finding patterns in text, including digits, letters, Unicode characters, and string literals
• Learn how to use zero-width assertions and lookarounds
• Work with groups, backreferences, character classes, and quantifiers
• Use regular expressions to mark up plain text with HTML5

For people who create and modify text files, sed and awk are power tools for editing. sed, awk, and regular expressions allow programmers and system administrators to automate editing tasks that need to be performed on one or more files, to simplify the task of performing the same edits on multiple files, and to write conversion programs.

The sed & awk Pocket Reference is a companion volume to sed & awk and Unix in a Nutshell. This small book is a handy reference guide to the information the larger volumes, presenting a concise summary of regular expressions and pattern matching, and summaries of sed and awk.

Most programming languages contain good and bad parts, but JavaScript has more than its share of the bad, having been developed and released in a hurry before it could be refined. This authoritative book scrapes away these bad features to reveal a subset of JavaScript that's more reliable, readable, and maintainable than the language as a whole-a subset you can use to create truly extensible and efficient code.


Considered the JavaScript expert by many people in the development community, author Douglas Crockford identifies the abundance of good ideas that make JavaScript an outstanding object-oriented programming language-ideas such as functions, loose typing, dynamic objects, and an expressive object literal notation. Unfortunately, these good ideas are mixed in with bad and downright awful ideas, like a programming model based on global variables.


When Java applets failed, JavaScript became the language of the Web by default, making its popularity almost completely independent of its qualities as a programming language. In JavaScript: The Good Parts, Crockford finally digs through the steaming pile of good intentions and blunders to give you a detailed look at all the genuinely elegant parts of JavaScript, including:

• Syntax


• Objects


• Functions


• Inheritance


• Arrays


• Regular expressions


• Methods


• Style


• Beautiful features

The real beauty? As you move ahead with the subset of JavaScript that this book presents, you'll also sidestep the need to unlearn all the bad parts. Of course, if you want to find out more about the bad parts and how to use them badly, simply consult any other JavaScript book.


With JavaScript: The Good Parts, you'll discover a beautiful, elegant, lightweight and highly expressive language that lets you create effective code, whether you're managing object libraries or just trying to get Ajax to run fast. If you develop sites or applications for the Web, this book is an absolute must.

For people who create and modify text files, sed and awk are power tools for editing. sed, awk, and regular expressions allow programmers and system administrators to automate editing tasks that need to be performed on one or more files, to simplify the task of performing the same edits on multiple files, and to write conversion programs.

The sed & awk Pocket Reference is a companion volume to sed & awk, Second Edition, Unix in a Nutshell, Third Edition, and Effective awk Programming, Third Edition. This new edition has expanded coverage of gawk (GNU awk), and includes sections on:

• An overview of sed and awk?s command line syntax
• Alphabetical summaries of commands, including nawk and gawk
• Profiling with pgawk
• Coprocesses and sockets with gawk
• Internationalization with gawk
• A listing of resources for sed and awk users

Arnold Robbins, an Atlanta native now happily living in Israel, is a professional programmer and technical author and coauthor of various O'Reilly Unix titles. He has been working with Unix systems since 1980, and currently maintains gawk and its documentation.