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Date: Sat, 27 Dec 2025 10:58:28 GMT
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Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.
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Unit Tests
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Show cheatsheet
{{flavors[reModel.flavor].external}} regex quick reference (hide):
Full {{flavors[reModel.flavor].external}} regex cheatsheet
| [abx-z] | One character of: a, b, or the range x-z |
| [^abx-z] | One character except: a, b, or the range x-z |
| a|b | a or b |
| a? | Zero or one a's (greedy) |
| a?? | Zero or one a's (lazy) |
| a* | Zero or more a's (greedy) |
| a*? | Zero or more a's (lazy) |
| a+ | One or more a's (greedy) |
| a+? | One or more a's (lazy) |
| a{4} | Exactly 4 a's |
| a{4,8} | Between (inclusive) 4 and 8 a's |
| a{9,} | 9 or more a's |
| (?>...) | An atomic group |
| (?=...) | A positive lookahead |
| (?!...) | A negative lookahead |
| (?<=...) | A positive lookbehind |
| (?<!...) | A negative lookbehind |
| (?:...) | A non-capturing group |
| (...) | A capturing group |
| (?P<n>...) | A capturing group named n |
| ^ | Beginning of the string |
| $ | End of the string |
| \d | A digit (same as [0-9]) |
| \D | A non-digit (same as [^0-9]) |
| \w | A word character (same as [_a-zA-Z0-9]) |
| \W | A non-word character (same as [^_a-zA-Z0-9]) |
| \s | A whitespace character |
| \S | A non-whitespace character |
| \b | A word boundary |
| \B | A non-word boundary |
| \n | A newline |
| \t | A tab |
| \cY | The control character with the hex code Y |
| \xYY | The character with the hex code YY |
| \uYYYY | The character with the hex code YYYY |
| . | Any character |
| \Y | The Y'th captured group |
| (?1) | Recurse into numbered group 1 |
| (?&x) | Recurse into named group x |
| (?P=n) | The captured group named 'n' |
| (?#...) | A comment |
Full {{flavors[reModel.flavor].external}} regex cheatsheet
Sharing Expression
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Embed Expression
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