Regex Tester

The tool provides a precise, engine-accurate regex tester accessible in the browser. It accepts a pattern and optional flags; a test string is evaluated in real time, returning a structured result that includes full matches, capture groups, and their indices.
Core behavior includes compiling the pattern with given flags, applying it to the test string, and returning matches or an error when the pattern is invalid. When the global flag is present, all occurrences are captured; capture groups and their start/end positions are exposed for each match. Unicode and named groups are shown when supported by the engine, and results can be exported for regression testing.
Audience spans developers, QA engineers, data scientists, and educators who validate parsing and validation logic. The tool’s value lies in immediate, deterministic outputs focused on domain logic rather than UI elements, enabling precise pattern refinement and faster debugging. Use cases include email validation, password rules, URL extraction, and data extraction pipelines. Unique differentiators are structured per-match data, explicit indices, and support for common regex features across engines, enabling reproducible results and easier collaboration.