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Test regular expressions with instant highlighting, flag toggles, and a detailed match list.
Matches 11
Match Details
Format, validate, and minify JSON with syntax highlighting and error detection
Decode and inspect JSON Web Token headers, payloads, and expiry claims
Encode text or files to Base64 and decode Base64 strings back to plain text
Convert Unix timestamps to human-readable dates and vice versa, in any timezone
Enter your regex pattern
Type your regular expression in the pattern field. The / delimiters are shown for clarity but should not be included in your input.
Toggle flags
Enable g (global), i (case insensitive), m (multiline), or s (dotall) flags using the flag buttons.
Type your test string
Enter or paste the text you want to test against in the Test String area.
See live highlights
All matches are highlighted in amber in the preview area as you type.
Review match details
The match list shows each match, its position index, and a copy button for individual matches.
Unlike most online tools, Toolivon processes everything directly in your browser using the Web APIs built into Chrome, Firefox, Safari, and Edge.
Last updated:
Your data never leave your device
All processing runs directly in your browser using built-in Web APIs — the Canvas API, Web Audio API, and WebAssembly. Nothing is uploaded to any server. There is no account, no email, and no data retention. You can verify this yourself: open your browser's DevTools Network tab and watch zero outbound file requests while the tool processes your data.
GDPR-friendly · Works offline after page load · No file size limits beyond your device memory