Regex Tester
Test JavaScript regular expressions against sample text with match positions, capture groups, and flags.
What this tool does
Test JavaScript regular expressions against sample text with match positions, capture groups, and flags.
Where this tool is useful
Debug literal patterns and supported JS flags without submitting text to a server.
Example or format details
Debug literal patterns and supported JS flags without submitting text to a server.
How to use Regex Tester
- 1
Paste the technical input into the form and choose any relevant algorithm or formatting options.
- 2
Adjust the fields and options, then select Run tool.
- 3
Inspect the actual result. Copy the text or download the generated file when appropriate.
Privacy and processing
Entered content and chosen files are processed locally in your browser. No conversion request is sent to a freedropper server.
Common questions
What can I use this for?
Debug literal patterns and supported JS flags without submitting text to a server.
What does the tool accept?
Paste the technical input into the form and choose any relevant algorithm or formatting options.
What should I check before using the output?
Check the accepted input, output format and settings before reusing the result. Debug literal patterns and supported JS flags without submitting text to a server.
Does my input leave my device?
The utility runs in your browser. Selected content is not transmitted to a freedropper conversion service.
How can I reuse the result?
Copy the output or use the download control when the tool produces a file. Check the target application accepts the resulting syntax or file type.