Regular Expressions

LAST UPDATED: DECEMBER 29, 2025

• Literal Matching

  • Matching Outcomes

    1. Pattern Not Present

    2. Pattern Matches Entire Text

    3. Pattern as a Substring

  • Wildcard Character

  • Escaping

• Character Classes

  • Literal Characters

  • Ranges

  • Negations

  • Shorthand Classes

    1. Digits

    2. Whitespaces

    3. 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

    1. Zero or More

    2. One or More

    3. Zero or One

  • Counted Quantifiers

    1. Exact Repetition

    2. Bounded Repetition

    3. Minimum Repetition

• Grouping Constructs

  • Alternations

  • Nested Groups

  • Backreferences

  • Lookarounds

    1. Lookaheads

    2. Lookbehinds

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