DocsBacktracking →Basics →Boundaries →Built-in Variables →Character Classes →Comparison With Other Projects →Enable Unicode Support →Example: Email Addresses →Example: IP Addresses →Example: Java Identifiers →Example: Numbers →Example: Passwords →Example: Semantic Version →Formal Grammar →Graphemes →Groups →Inline Regular Expressions →Introduction →Lookaround →Quick Start →Ranges →References →Repetitions →Security →Shorthands →Unicode Properties →Variables →