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| Introduction | Table of Contents | Special Characters | Non-Printable Characters | Regex Engine Internals | Character Classes | Character Class Subtraction | Character Class Intersection | Shorthand Character Classes | Dot | Anchors | Word Boundaries | Alternation | Optional Items | Repetition | Grouping & Capturing | Backreferences | Backreferences, part 2 | Named Groups | Relative Backreferences | Branch Reset Groups | Free-Spacing & Comments | Unicode Characters & Properties | Mode Modifiers | Atomic Grouping | Possessive Quantifiers | Lookahead & Lookbehind | Lookaround, part 2 | Lookbehind Limitations | (Non-)Atomic Lookaround | Keep Text out of The Match | Conditionals | Balancing Groups | Recursion and Subroutines | POSIX Bracket Expressions | Zero-Length Matches | Continuing Matches | Backtracking Control Verbs | Control Verb Arguments |