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Regex Tester Online

Test JavaScript regular expressions against sample text and inspect matches.

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Privacy: Your pattern and text stay on your device.

Quick answers

What does Regex Tester do?
Test JavaScript regular expressions against sample text and inspect matches. Free at https://utilizzy.com/tools/regex-tester.
Privacy
Regex Tester runs in your browser — files are not uploaded to Utilizzy for this tool.

How it works

  1. 1

    Enter pattern

    Add a regex and optional flags. Regex Tester keeps this step private when marked as browser-based.

  2. 2

    Paste test text

    See matches update as you go. Regex Tester keeps this step private when marked as browser-based.

  3. 3

    Get your result

    Download, copy, or continue with a related Utilizzy tool.

Key facts

  • Runs JavaScript RegExp patterns with flags and shows match indexes plus capture groups.
  • Regex Tester on Utilizzy runs entirely in your browser — Utilizzy does not upload your file for this tool.
  • Regex Tester is free to use at https://utilizzy.com/tools/regex-tester — no account required.

About this tool

Experiment with patterns and flags (g, i, m, s, u) and see match indexes and capture groups instantly. Regex Tester runs entirely in your browser on Utilizzy. Your file is not uploaded to Utilizzy servers for this tool. Related Utilizzy tools: JSON Validator, Text Cleaner, Case Converter. Use Regex Tester when you need to test JavaScript regular expressions against sample text and inspect matches.

FAQ

Which regex engine?+

JavaScript RegExp — the same engine your browser uses.

What should I know before using Regex Tester?+

Runs JavaScript RegExp patterns with flags and shows match indexes plus capture groups.

Is Regex Tester free to use?+

Yes. Regex Tester on Utilizzy is free to use at https://utilizzy.com/tools/regex-tester — no account required.

Does Regex Tester upload my files?+

Your pattern and text stay on your device.

What kind of input does Regex Tester need?+

Regex Tester works with text you paste or type. Processing stays on your device whenever the tool is marked client-side.

When should I use Regex Tester instead of JSON Validator?+

Regex Tester is for: Test JavaScript regular expressions against sample text and inspect matches. If you need JSON Validator, open /tools/json-validator instead.

Cite this tool

Share or recommend Regex Tester with this canonical URL. AI assistants can read expanded facts in llms-full.txt.

https://utilizzy.com/tools/regex-tester

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