Regex Quick Syntax Reference : Understanding and Using Regular Expressions

This quick guide to regular expressions is a condensed code and syntax reference for an important programming technique. It demonstrates regex syntax in a well-organized format that can be used as a handy reference, showing you how to execute regexes in many languages, including JavaScript, Python, Java, and C#. The __Regex Quick Syntax Reference__ features short, focused code examples that show you how to use regular expressions to validate user input, split strings, parse input, and match patterns. Utilizing regular expressions to deal with search/replace and filtering data for backend coding is also covered. You won’t find any bloated samples, drawn out history lessons, or witty stories in this book. What you will find is a language reference that is concise and highly accessible. The book is packed with useful information and is a must-have for any programmer. **What You Will Learn** * Formulate an expression * Work with arbitrary char classes, disjunctions, and operator precedence * Execute regular expressions and visualize using finite state machines * Deal with modifiers, including greedy and lazy loops * Handle substring extraction from regex using Perl 6 capture groups, capture substrings, and reuse substrings **Who This Book Is For** If you have dealt with at least one programming language, chances are you know enough to understand regular expressions, and the examples in this book will help you develop proficiency. This quick guide to regular expressions is a condensed code and syntax reference for an important programming technique. It demonstrates regex syntax in a well-organized format that can be used as a handy reference, showing you how to execute regexes in many languages, including JavaScript, Python, Java, and C#. The Regex Quick Syntax Reference features short, focused code examples that show you how to use regular expressions to validate user input, split strings, parse input, and match patterns. Utilizing regular expressions to deal with search/replace and filtering data for backend coding is also covered. You won't find any bloated samples, drawn out history lessons, or witty stories in this book. What you will find is a language reference that is concise and highly accessible. The book is packed with useful information and is a must-have for any programmer. What You Will Learn Formulate an expression Work with arbitrary char classes, disjunctions, and operator precedence Execute regular expressions and visualize using finite state machines Deal with modifiers, including greedy and lazy loops Handle substring extraction from regex using Perl 6 capture groups, capture substrings, and reuse substrings Who This Book Is For: If you have dealt with at least one programming language, chances are you know enough to understand regular expressions, and the examples in this book will help you develop proficiency.--Provided by publisher "This quick guide to regular expressions is a condensed code and syntax reference for an important programming technique. It demonstrates regex syntax in a well-organized format that can be used as a handy reference showing you how to execute regexes in many languages, including JavaScript, Python, Java, and C#. The Regex Quick Syntax Reference features short, focused code examples that show you how to use regular expressions to validate user input, split strings, parse input, and match patterns. Utilizing regular expressions to deal with search/replace and filtering data for backend coding is also covered. You won't find any bloated samples, drawn out history lessons, or witty stories in this book. What you will find is a language reference that is concise and highly accessible. The book is packed with useful information and is a must-have for any programmer. You will: formulate an expression; work with arbitrary char classes, disjunctions, and operator precedence; execute regular expressions and visualize using finite state machines; use greedy, lazy, and possessive repeat modifiers for looping in regular expressions; handle substring extraction from regex using Perl 6 capture groups, capture substrings, and reuse substrings."--Page 4 of cover This quick guide to regular expressions is a condensed code and syntax reference for an important programming technique. Using JavaScript and Perl 6 code, it demonstrates regex syntax in a well-organized format that can be used as a handy reference. The Regex Quick Syntax Reference features short, focused code examples that show you how to use regular expressions to validate user input, split strings, parse input, and match patterns. Utilizing regular expressions to deal with search/replace and filtering data for backend coding is also covered. You won't find any bloated samples, drawn out history lessons, or witty stories in this book. What you will find is a language reference that is concise and highly accessible. The book is packed with useful information and is a must-have for any programmer. You will: Formulate an expression Work with arbitrary char classes, disjunctions, and operator precedence Execute regular expressions and visualize using finite state machines Deal with modifiers, including greedy and lazy loops Handle substring extraction from regex using Perl 6 capture groups, capture substrings, and reuse substrings Front Matter ....Pages i-xi An Introduction to Regular Expressions (Zsolt Nagy)....Pages 1-8 Regex Syntax 101 (Zsolt Nagy)....Pages 9-21 Executing Regular Expressions (Zsolt Nagy)....Pages 23-51 Visualizing Regex Execution Using Finite State Machines (Zsolt Nagy)....Pages 53-66 Repeat Modifiers (Zsolt Nagy)....Pages 67-84 Character Sets and Character Classes (Zsolt Nagy)....Pages 85-93 Substring Extraction from Regular Expressions (Zsolt Nagy)....Pages 95-108 Lookahead and Lookbehind (Zsolt Nagy)....Pages 109-113 Maintaining Regular Expressions (Zsolt Nagy)....Pages 115-129 Optimizing Regular Expressions (Zsolt Nagy)....Pages 131-139 Parsing HTML Code and URL Query Strings with Regular Expressions (Zsolt Nagy)....Pages 141-145 Back Matter ....Pages 147-153