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Free online regex tester running real WASM builds of PCRE2, RE2, .NET, Python, Java, Go, Rust and JavaScript in your browser. Step-through debugger with backtracking flame graph, benchmark suite, AI generator, 14k+ pattern gallery. Free, no signup, no cookies.
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JS regex is only one dialect; patterns that pass in JS often fail in PCRE2 or .NET. RegexTester.dev runs the real engines, so what you test is what ships.
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Every run, kept
Each relaunch keeps its own locked result and placement.
Every run, kept
Each relaunch keeps its own locked result and placement.
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2026-10-17
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