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Test patterns and inspect real-time regex matches.
Format, decode, generate, and validate developer data locally.
UseDaily's free online regex tester lets you write and test regular expressions against sample text in real time. See all matches highlighted instantly, adjust flags on the fly, and debug your patterns without leaving the browser.
Enter your regex pattern in the pattern field and set flags as needed. Paste your test text into the editor. Matches are highlighted and listed immediately as you type.
Highlights all regex matches in the input text as you type your pattern.
Supports g (global), m (multiline), i (case-insensitive), and other standard flags.
Lists all captured groups and match positions for detailed debugging.
All processing happens in your browser. Your data is never sent to any server.