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regex101 Pro

You already trust regex101 to test a pattern. Pro is for everything that happens after it matches.

A regex that works in the editor can still blow up in production: a pathological input that pegs a CPU core, a 400-character expression nobody on the team can safely review, a "small tweak" that quietly triples tail latency. regex101 Pro turns the world's most-used regex tester into a regex IDE built to catch those problems before your users do.

What you get today​

  • Intellisense: get context-aware syntax suggestions, guided values, and parser-aware repairs while you write a pattern or substitution.
  • Advanced Benchmarking: measure exactly how a pattern performs under real and adversarial input. Median, tail latency, jitter, throughput, and a per-sample timeline that makes catastrophic backtracking impossible to miss.
  • Format Regex: deterministic formatting for free-spacing patterns. Turn a wall of escapes into a structure you can actually read, review, and ship.
  • Multiple Test Strings: test a pattern against as many inputs as you need, with results updating across the entire set as you edit.
  • Substitution Pipeline: build multi-step transformations where each substitution receives the output of the layer before it.

Why it's worth paying for​

Every other regex tool stops at "does it match?" That is the easy 80%. The expensive 20%, is it fast, is it safe, can my team maintain it?, is exactly where regex causes real outages and real review pain, and exactly what Pro is built to answer.

regex101 has served regex to more than 20 million developers. Pro is that same engine accuracy, pointed at the problems that actually cost you time and uptime.

On the roadmap​

The direction is a full regex workbench: deeper benchmark workflows and more tooling for patterns that live in real codebases. Pro features ship as they are ready.

For plans, access, or feature ideas, contact contact@regex101.com.