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#developmentUpdated 2026-05-30

Regex Tester

Test and debug regular expressions against sample text.

Input

Output

Result will appear here.
runs locally

Features

  • Live match highlighting
  • Flag toggles
  • Group breakdown

How to use Regex Tester

  1. 1Enter a pattern and flags
  2. 2Paste sample text
  3. 3Review highlighted matches

Example

Input — Pattern

\d{3}-\d{4}

Output

Matches: 555-0182

What Regex Tester does

Test and debug regular expressions against sample text. It runs entirely client-side, so nothing you enter is sent to a server — useful when working with sensitive data or when you just want an instant result without waiting on a network round-trip.

Common use cases

  • Validating form input patterns
  • Debugging log-parsing regex

FAQ

Which regex flavor is used?

Standard JavaScript (ECMAScript) regex syntax.

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