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Regex Tester

Test patterns, explain matches, and iterate on edge cases faster.

JSON Formatter
Regex Tester
Try a pattern against sample text, inspect the match list, and tweak flags without leaving the browser.
Ctrl+Enter Test Groups and indexes Global flag aware
Sample text Editable input
1 line | 0 chars
Matches Read only output
0 matches
Ready Local execution
Enter a pattern, optional flags, and some sample text to inspect matches and capture groups.
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Regex Tester

Regular expressions are powerful, but they are notoriously easy to get wrong when you are working quickly. A tester helps by compiling the pattern, showing whether it actually matches the sample text, and listing every hit with indexes and capture groups.

This tester runs entirely in the browser and keeps the workflow simple: pattern, flags, sample text, and a structured result object you can copy into notes or debugging output.

How to Use the Regex Tester

  1. Enter a regex pattern and optional flags such as g or i.
  2. Paste or type sample text into the left editor.
  3. Run Test regex to inspect all matches and capture groups.
  4. Copy the result JSON if you need to share the match details.

Regex Tester Examples

Before 
Pattern: \b(WARN|ERROR)\b
Flags: g
Text: WARN cache miss
ERROR request failed
After 
{
  "pattern": "\b(WARN|ERROR)\b",
  "flags": "g",
  "found": 2
}

Frequently Asked Questions

  • Can I test global matches?

    Yes. Add the g flag and the tool will list every match in the sample text.

  • Does it show capture groups?

    Yes. Each match entry includes the captured groups array.

  • Is the test text uploaded?

    No. Pattern compilation and matching happen locally in the browser.

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