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Free RegEx Tester & Builder Online
Free RegEx Tester & Builder Online is a free online tool by US AI. Test patterns live It runs completely in your browser — no signup, no download, works on mobile and desktop.
📖 How to use
- Type a pattern, set flags or pick a preset, then test it live against your text. Matches are highlighted.
- Open the tool with the button above — it loads instantly.
- Your work stays on your device; nothing is uploaded anywhere.
✨ Why use this tool?
US AI's free regex tester & builder online is fast, private and 100% free forever. Bookmark this page and share it with anyone who needs it.