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Regex Tester

Test regular expressions against text online. Fast, free, and completely private.

Regex Tester
Enter a regex pattern, choose flags, and test it against sample text to find matches and capture groups.
Flags
Large inputs and complex patterns may be limited to keep the tool fast.
Results
Test results will appear here.
Highlighted matches will appear here.
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How to use Regex Tester

1

Paste Input

Paste your text, code, data, or values into the editor above.

2

Choose Options

Adjust any formatting, conversion, or processing options for your task.

3

Copy or Download Result

Copy the result or download it when an export option is available.

Key Features

  • Lightning Fast: Results are generated almost instantly using state-of-the-art tech.
  • 100% Free: No hidden costs, no premium tiers, and no subscriptions required.
  • No Registration: Start using the tool immediately without providing an email address.
  • Secure & Private: Files are processed locally or deleted immediately from our secure servers.

Frequently Asked Questions

Is this regex tester free?

Yes, you can test regular expressions against text completely for free.

What is a regular expression?

A regular expression is a pattern used to search, match, validate, or extract text.

Which regex engine does this use?

This tool uses JavaScript regular expression behavior.

Can I test JavaScript regex patterns?

Yes, the tester supports common JavaScript regex flags including global, case-insensitive, multiline, dotAll, and unicode.

What does the global flag mean?

The global flag finds every match in the text instead of stopping after the first match.

What does the case-insensitive flag mean?

The case-insensitive flag matches letters regardless of uppercase or lowercase.

Can I view capture groups?

Yes, each match shows numbered capture groups and named groups when your pattern uses them.

Can I test email regex?

Yes, you can load the sample email regex or paste your own validation and extraction pattern.

Why is my regex not matching?

Check the pattern syntax, selected flags, anchors, escaping, and whether your test text contains the expected format.

Are my regex patterns stored?

Toolkit does not store your regex patterns or test text permanently.

Does this work on mobile?

Yes, the Regex Tester works on phones, tablets, and desktops.