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Developer ToolsFree online tool
Test a regular expression against sample text and inspect matches and capture groups.
Paste or enter the data you want to process, then run the tool.
Use the controls above, check the result, then copy or download it when available.
No. It only evaluates the pattern against the sample text you provide.
Use this tool whenever you need: Developing and debugging patterns before adding them to code or validation rules. It offers a fast, client-side workflow without sign-ups, installation or complex software.
Yes. All processing executes locally in your browser using client-side JavaScript. Your inputs, files and calculations remain private and are never uploaded to our servers.
Test normal, boundary and unexpected inputs rather than checking only one successful example. Important note: Browser regular-expression behavior follows JavaScript regex rules and may differ from another regex engine.
Developer utility
Write a pattern, paste some text, and inspect every match locally.
JavaScript regular-expression syntax. Maximum 300 characters.
Common: g, i, m, s, u
Output
0 matches
No matches found
Try adjusting the pattern or adding text to test.
Quick reference
\d digit\w word character. any character