JavaScript regex matches
Patterns run only on demand with strict pattern, text and match limits.
JavaScript Regex Tester Online
Test JavaScript regular expressions, flags, capture groups and replacements locally.
Tokens, patterns and files are processed locally and are not stored.
0 characters · 0 bytes → 0 / 0
How to use JavaScript regex matches
- 1
Enter or load the data locally.
- 2
Choose the visible options and process the content.
- 3
Review warnings before copying or downloading.
Features and limitations
Local privacy
Files are not uploaded and inputs are not automatically stored.
Safe export
Copy or download UTF-8 results created in the browser.
Frequently asked questions
How does this tool work?
Patterns run only on demand with strict pattern, text and match limits.
Is my data uploaded?
No. Processing stays in the browser and uses no external APIs.
What are its limitations?
Validation is local and syntactic; remote resources are not queried or verified.