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Regex Notation
Regex Quick Reference
| Symbol | Description | |
|---|---|---|
| [abc] | A single character: a, b or c | |
| [\ | abc] | Any single character but a, b, or c |
| [a-z] | Any single character in the range a-z | |
| [a-zA-Z] | Any single character in the range a-z or A-Z | |
| \ | Start of line | |
| $ | End of line | |
| \A | Start of string | |
| \z | End of string | |
| . | Any single character | |
| \s | Any whitespace character | |
| \S | Any non-whitespace character | |
| \d | Any digit | |
| \D | Any non-digit | |
| \w | Any word character (letter, number, underscore) | |
| \W | Any non-word character | |
| \b | Any word boundary character | |
| (…) | Capture everything enclosed | |
| (a | b) | a or b |
| a? | Zero or one of a | |
| a* | Zero or more of a | |
| a+ | One or more of a | |
| a{3} | Exactly 3 of a | |
| a{3,} | 3 or more of a | |
| a{3,6} | Between 3 and 6 of a |
options:
i case insensitive
m make dot match newlines
x ignore whitespace in regex
o perform #{...} substitutions only once