Test Regular Expressions Privately — Your Patterns Stay Local
BigWow's Private Regex Tester evaluates all matches using your browser's native JavaScript RegExp engine. Unlike Regex101 and other popular testers that send your input to a backend, BigWow runs everything in local memory.
Real-time matching with zero network requests to any backend.
Supports all ES2022 regex features: named groups, lookbehinds, unicode properties.
0 input characters are stored in any server database or log file.
Frequently Asked Questions
Why should I avoid testing regex with sensitive data on Regex101?
Regex101 processes your input on their servers and may store recent patterns. BigWow tests entirely in your browser with no server interaction.
Does this tester support named capture groups and lookaheads?
Yes. It uses the browser's native RegExp engine, supporting all modern ECMAScript features including named groups, lookbehinds, and unicode property escapes.
Sources & References
- ECMA-262 ECMAScript Language Specification defining the RegExp object and matching algorithm.
- OWASP Input Validation Cheat Sheet recommending local-only processing for sensitive pattern testing.
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