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Regex Tester

Validate and debug JavaScript regex patterns quickly.

Runs locally in your browser.

Regex flavor: JavaScript (ECMAScript RegExp). Input is processed locally in your browser.

Matches

  • index: 0

    error: invalid email

    groups: error | invalid email

  • index: 40

    warn: cache miss

    groups: warn | cache miss

  • index: 57

    error: timeout

    groups: error | timeout

Replacement output

[error] invalid email
info: health check
[warn] cache miss
[error] timeout

How to use

  1. Enter regex pattern and flags.
  2. Paste test text to view matches and groups.
  3. Use replace preview to test replacement templates.

Limitations and caveats

  • Implements JavaScript regex flavor only.

Related tools

JavaScript PlaygroundRun JavaScript code in an isolated sandbox and inspect logs and errors.JSONPath TesterQuery JSON documents using JSONPath and inspect formatted results.HTML/CSS/JS PlaygroundEdit HTML, CSS, and JavaScript with live sandbox preview and console output.