Regex Tester

Test JavaScript regular expressions against sample text in real time.

Pattern

Flags

Sample text

Drop a text file here or choose a fileChoose fileChoose file · .TXT, .MD, .MARKDOWN, .JSON, .CSV, .HTML, .HTM, .LOG, .XML, .YML, .YAML, .TSV, .RTF, .TEXT, .PDF, .DOCX

The sample is too large. Use at most 1,000,000 characters.

Matches: 0

Output

Try a regular expression against this sample text.

Matched values

No matches.

Everything runs locally in your browser.

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Regex Tester

Test JavaScript regular expressions against sample text in real time. Your text is processed locally in your browser and is never uploaded to a server.

How this tool works

Enter a JavaScript pattern and flags to see matches, highlighted output, and capture groups as you type. Large inputs and match lists are safely capped. Your text is processed locally in your browser and is never uploaded to a server. You can paste text or load supported text and document files, including TXT, Markdown, CSV, HTML, PDF, and DOCX.

Frequently Asked Questions (FAQ)

What does this tool do?

Test JavaScript regular expressions against sample text in real time.

Is my text uploaded?

No. Your text is processed locally in your browser and is never uploaded to a server.

Can I use a file instead of pasting?

Yes. You can paste text or load supported text and document files, including TXT, Markdown, CSV, HTML, PDF, and DOCX.