Regex Analyzer
Paste a regex pattern to get a full insight report — headline metrics, detailed statistics, warnings, and improvement suggestions. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
(a+)+$
Example Output
groups, quantifiers, ReDoS risk
How to Use
- 1Paste the a regex pattern you want to analyze into the input box.
- 2If options are available (e.g. SQL dialect or regex flags), set them as needed.
- 3Click Analyze (or press Ctrl+Enter).
- 4Read the report: headline metric cards, detailed statistics, warnings, and recommendations.
About Regex Analyzer
Regex Analyzer breaks a pattern into metrics: group count, named groups, character classes, quantifiers, alternations, and lookarounds. Most importantly, it detects potential ReDoS (nested quantifiers) that can make matching extremely slow.
It recommends simplifications and flag usage. Unlike a validator: it judges quality & risk, not just valid/invalid.
FAQ
Is my data sent to a server?
No. The entire analysis runs in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.
How is this analyzer different from a parser, validator, or viewer?
An analyzer produces an insight report — metrics, statistics, warnings, and recommendations — to help you judge the quality or characteristics of the input. A parser breaks it into structure, a validator gives a valid/invalid verdict, and a viewer just displays it. An analyzer focuses on "how good / what are its characteristics".