Regex Visualizer

Write, visualize, and generate strings from Regular Expressions.

Regular Expression Input

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Step-by-Step DFA Construction

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Enter a regex to start.

Generated Strings

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Equivalence Verification

Check if another Regular Expression generates the exact same language.

Know More: Regular Expressions

A Regular Expression (Regex/RegExp) is a sequence of characters that specifies a search pattern. They are extremely powerful for text processing, data validation, and parsing.

  • Tokens & Quantifiers: Characters like \d match numbers, while quantifiers like + or * indicate how many times the token should match.
  • DFA & NFA: Under the hood, patterns are compiled into Finite Automata. A Nondeterministic Finite Automaton (NFA) allows multiple paths for a single input, while a Deterministic Finite Automaton (DFA) has precisely one path, ensuring faster evaluation time.