No matches found.
| Token | Meaning |
|---|---|
\d | Any digit [0-9] |
\w | Word character [a-zA-Z0-9_] |
\s | Whitespace character |
(?=abc) | Positive lookahead |
(?!abc) | Negative lookahead |
(?<=abc) | Positive lookbehind |
(?<!abc) | Negative lookbehind |
(?<name>) | Named capture group |
(?:...) | Non-capturing group |
^ / $ | Start / End of string |
+? / *? | Lazy quantifiers |
\p{L} | Unicode letter category |
No saved patterns yet.
Nordic Cyber Security’s Regex Tester is engineered for security researchers, software developers, and cloud engineers. Analyze zero-width assertions (lookahead/lookbehind), prevent Regular Expression Denial of Service (ReDoS) vulnerabilities with automated linting, inspect multi-language Unicode categories, and benchmark run-time operations safely in your browser.
