Regular Expressions Last Updated: December 29, 2025 Literal Matching Matching Outcomes Pattern Not Present Pattern Matches Entire Text Pattern as a Substring Wildcard Character Escaping Character Classes Literal Characters Ranges Negations Shorthand Classes Digits Whitespaces Word Characters Special Cases Anchors Start Anchors End Anchors Start and End Anchors Word and Non-Word Boundaries Word Boundaries Non-Word Boundaries Quantifiers Symbol Quantifiers Zero or More One or More Zero or One Counted Quantifiers Exact Repetition Bounded Repetition Minimum Repetition Grouping Constructs Alternations Nested Groups Backreferences Lookarounds Lookaheads Lookbehinds
