Mastering Regular Expressions (Jeffrey E. F. Friedl)
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- Interesting Topics:
- Regex syntax is taught as a language for specifying text structure
- The matching engine explains backtracking, alternation, and unexpected results
- Performance is treated as a consequence of pattern design and input shape
- Flavor differences determine what a portable regular expression can mean
- Real text-processing tasks require limits as well as expressive patterns
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Mastering Regular Expressions by Jeffrey E. F. Friedl is a technical programming guide to the design, interpretation, and efficient use of regular expressions for text processing. Originally associated with the third edition published by O Reilly in 2006, it moves beyond a catalog of metacharacters to explain how regex engines actually search, choose alternatives, capture text, and sometimes fail. Friedl treats regular expressions as practical engineering tools rather than compact puzzles. The book begins with essential syntax, then develops a detailed model of matching behavior, including backtracking, alternation, grouping, assertions, and performance consequences. Its later material compares major regex implementations and discusses use in languages and environments such as Perl, Java, .NET, PHP, Python, Ruby, and MySQL. Throughout, the purpose is to help readers write expressions that are accurate, maintainable, and appropriately efficient for real tasks such as validation, extraction, search, formatting, and log processing.