Dive into the world of regular expressions with this comprehensive 3.5-hour tutorial. Master the fundamentals of regex, including dot matches, optional characters, character sets, and alternations. Explore practical applications through JavaScript and PHP examples, and learn advanced concepts such as groups, quantifiers, anchors, and flags. Apply your knowledge by writing expressions and delve into related topics like streams, redirection, and piping. Demystify regular expressions and enhance your text processing skills for more efficient coding and data manipulation.