| All Characters | [\s\S]* |
| Any character except newline | . |
| Any word, digit, whitespace character | \w \d \s |
| Any non-word, digit, whitespace character | \W \D \S |
| A single character of: a, b or c | [abc] |
| A character except: a, b or c | [^abc] |
| A character in the range: a-z | [a-z] |
| A character not in the range: a-z | [^a-z] |
| A character in the range: a-z or A-Z | [a-zA-Z] |
| Alternate - match either a or b | a|b |
| Match everything enclosed | (?:...) |
| Capture everything enclosed | (...) |
| Zero or one of a | a? |
| Zero or more of a | a* |
| One or more of a | a+ |
| Exactly 3 of a | a{3} |
| 3 or more of of a | a{3,} |
| Between 3 and 6 of a | a{3,6} |
| Start of string | ^ |
| End of string | $ |
| Word boundary | \b |
| Non-word boundary | \B |