Encoding & Utility Tools
Regex Privacy Pattern Tester
Build and test regular expressions for PII detection and privacy scanning. Paste sample text, write or pick a pattern from the built-in library, and see every match highlighted inline. Includes a replacement mode for testing redaction patterns. All computation is pure JavaScript — no data leaves the browser.
All processing happens locally in your browser. No data is uploaded.
Regular Expression
/
/
Flags:
Test Text
Annotated Output
Matches will be highlighted here…
All Matches
Replacement String
Use
$1, $2 for capture groups. Use [REDACTED], ████, or *** for privacy redaction.
Test Text
Replaced Output
Replaced text will appear here…
Click a pattern to load it into the regex input.