The “Mastering Regular Expressions” handbook by Jeffrey E. F. Friedl is a comprehensive guide focusing on regular expressions, a powerful tool used in programming languages like Perl and JavaScript. Published by O’Reilly Media in 2002, this trade paperback textbook offers in-depth coverage of regular expressions, making it a valuable resource for computer programming enthusiasts and professionals alike. With 496 pages and detailed explanations, this handbook is a must-have for anyone looking to enhance their understanding and proficiency in using regular expressions in their programming tasks.