RegEx Tester
Test JavaScript regular expressions locally, inspect matches and capture groups, and preview replacements.
Pattern and text
Private by design: your test data never leaves your device.
The tester uses native JavaScript/ECMAScript RegExp semantics. Other engines can behave differently.
A successful test does not prove a regular expression is fast for large or hostile inputs.
Matches
Enter a pattern and test text.
Test suite
Match/No-Match-Fälle lokal ausführen.
Good to know
Good to know
The RegEx Tester helps you test regular expressions, patterns, flags, and capture groups directly in your browser. It is useful for development, debugging, API testing, documentation, and technical reviews when data needs to be checked quickly or moved into another format.
Typical searches for this page include regex tester, test regular expression, JavaScript regex tester, regex groups, and pattern matching. Processing runs locally in the browser, so sample values, internal payloads, and technical snippets are not sent to a server. Regex can easily match too broadly or too narrowly; always test several positive and negative examples.
Typical use cases
API and payload debugging
Check regular expressions, patterns, flags, and capture groups from REST APIs, webhooks, logs, or browser developer tools before using it in tests, documentation, or production configuration.
Documentation and code review
Prepare data so it stays understandable and reproducible in pull requests, README files, tickets, and technical specifications.
Local inspection of sensitive data
Use the tool for internal examples, technical test values, or confidential fragments without copying them into external online services.
Tips for better results
Check the input format deliberately
Many issues come from wrong quotes, missing escapes, unexpected whitespace, or copied prefixes. Check the input first before using the result further.
Validate the result in context
Formatting and conversion do not replace domain validation. For data migrations, security values, or production configuration, always check what the result means.
How it works
How it works
Step by step
Features
Features
Runs locally in the browser
Inputs are processed on your device and are not sent to a server for processing.
For developer workflows
Useful for API data, configuration files, logs, test data, and technical documentation.
Instantly reviewable result
The result is visible immediately and can be copied or downloaded for the next step.
Frequently asked questions
Frequently asked questions
Is data uploaded when using the RegEx Tester?
No. Processing runs locally in the browser. Inputs are not transferred to Xoricon or another server.
Can I use the result directly?
Yes, for tests, examples, and documentation. For production data, also validate the result in the target system.
Why can an input fail?
Common causes are a wrong format, missing escapes, invalid characters, incomplete data, or a variant that does not match the expected standard.
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