| Module Information |
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| Common Tokens |
| . |
Any character except newline |
| a |
The character 'a' |
| ab |
The string 'ab' |
| a|b |
The character 'a' or 'b' |
| *a |
0 or more characters 'a' |
| \ |
Escapes a special character |
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| Quantifiers |
| * |
0 or more |
| + |
1 or more |
| ? |
0 or 1 |
| {2} |
Exactly 2 |
| {2,5} |
Between 2 and 5 |
| {2,} |
2 or more |
| (,5} |
Up to 5 |
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| Groups |
| (...) |
Capturing group |
| (?P<foo>) |
Capturing group named 'foo' |
| (?:...) |
Non-capturing group |
| \Y |
Match the Y'th captured group |
| (?P=foo) |
Match the named group 'foo' |
| (?#...) |
Comment |
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| Character Classes |
| [ad-f] |
One character of: a, d, e, f |
| [^ad-f] |
One character except: a, d, e, f |
| \s |
Any whitespace character |
| \S |
Any non-whitespace character |
| \d |
Any digit |
| \D |
Any non-digit |
| \w |
Any word character |
| \W |
Any non-word character |
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| Assertions |
| ^ |
Start of string |
| $ |
End of string |
| \b |
Any word boundary |
| \B |
Any non-word boundary |
| (?=...) |
Positive lookahead |
| (?!...) |
Negative lookahead |
| (?<=...) |
Positive lookbehind |
| (?(foo)yes|no) |
Conditional match for capturing group 'foo' |
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| Flags |
| (?aiLmsux) |
One or more letters from the flags below |
| (?a) |
ASCII-only matching |
| (?i) |
Ignore case |
| (?L) |
Locale dependent |
| (?m) |
Multi-line |
| (?s) |
dot matches all |
| (?u) |
Unicode matching |
| (?x) |
Verbose |
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| Special Characters |
| \n |
Newline |
| \r |
Carriage return |
| \t |
Tab |
| \YYY |
Octal character 'YYY' |
| \xYY |
Hexadecimal character 'YY' |
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| Replacement |
| \g<0> |
Insert entire match |
| \g<foo> |
Insert match 'foo' |
| \Y |
Insert group numbered Y |
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