Input
Pattern
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Secondary input
Regression cases (JSON)
Output
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Recent runs
Only execution metadata (time, action, status, duration, and result size) from the last 30 days is stored in this browser, up to 20 runs. Inputs, result content, filenames, location, and device data are never saved.
Direct answer
Use Regex Tester with verifiable output
Applies a JavaScript regular expression globally and lists each full match with its zero-based index.
What does this tool do?
Use it to verify which substrings a JavaScript pattern matches in representative text before reusing the pattern.
Supported inputs
- A JavaScript regular expression pattern and test text
Outputs
- A JSON list of full match values and indices
How to use it
- Enter the pattern in Input and the sample text in Test text.
- Select Test Regex to apply the pattern globally.
- Review each full match value and index in the JSON output.
Reproducible example
InputPattern: \d{4}-\d{2} / Text: 2026-09The output lists 2026-09 at index 0.
Checks
- Check all returned values and zero-based indices against the sample text.
Limitations
- JavaScript regular expressions differ from PCRE, Java, and other engines.
Privacy
Inputs and results are processed only in browser memory and are not sent to the server, analytics, or browser storage.
Sources and standards
Related tools
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Search Answer
Regex Tester Search Answer
Regex Tester is a validation / testing / parsers category tool for quick validation and testing, with easy result copying and downloading.
Key Points
- Category: Validation / Testing / Parsers
- Execution mode: browser
- Recent runs is stored in your browser only.
- Inputs are processed during execution but not stored. Recent runs stays in the browser, while lightweight visit, usage, and like metrics are recorded.
How to Use
- Paste or type your input.
- Choose the needed options or fill the secondary input.
- Run the tool from the run bar above the panels.
- Review the result, then copy or download it.
Search Answer
Frequently Asked Questions
What does Regex Tester do?
Regex Tester is a tool for quick validation and testing in the validation / testing / parsers category.
Does Regex Tester store my input?
Inputs are processed during execution but not stored. Recent runs stays in the browser, while lightweight visit, usage, and like metrics are recorded.
When should I use Regex Tester?
Regex Tester is useful when you need to review or organize Validation / Testing / Parsers data quickly.
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