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Performance and Reliability

Built for live editing​

The parser is meant to run while users type. It reparses the full expression on each change in linear time (O(n)), which keeps performance predictable even as patterns grow.

Benchmark signal​

  • RFC822 email regex parse time: <10ms on a modern MacBook Pro
  • Largest tested expression size: limited by available RAM

Reference pattern: RFC822 email regex

Quality and confidence​

  • 2000+ tests across flavors and edge cases
  • 97% code coverage
  • Production-tested on regex101 traffic from millions of users

Correctness in practice​

This parser is designed around engine-accurate validation. In day-to-day use, that means accepted patterns are expected to run in the target engine without parser-engine mismatch errors.