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Utilnivo

Developer

Regex Tester

  • Browser-based
  • No signup

Enter a JavaScript regular expression, choose flags, and paste sample text to see live matches with indices, capture groups, and highlighted text. Matching runs entirely in your browser.

100% Client-Side

Your data never leaves your computer.

How to use this tool

1. Enter a regex pattern. 2. Enable flags such as global or ignore case as needed. 3. Paste or type a test string. 4. Review highlighted matches and the match list with groups. 5. Copy matches from the results panel if needed.

Worked example

Example: pattern \d+ on text Order 42 and 7 finds 42 and 7 as separate matches with the global flag enabled.

How it works

Enter a JavaScript regular expression pattern, optional flags, and sample text. Matches update as you type and show index, length, and capture groups. Highlighted text marks each match. Processing runs entirely in your browser.

Limitations

Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.

Privacy and file handling

Your data is processed in your browser and is not uploaded to our server.

Frequently asked questions

Which regex flavor is used?

Patterns use JavaScript regular expressions, including flags for global, ignore case, multiline, dot all, and unicode.

Are capture groups shown?

Yes. Numbered and named capture groups are listed for each match, along with the match index and length.

Is my text stored?

No. Matching runs locally in your browser and input is not stored.

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Related pages

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