PICK ONE| REGULAR EXPRESSION SYNTAX | |
| ^ | Start of string |
| $ | End of string |
| . | Any single character |
| (a|b) | a or b |
| (...) | Group section |
| [abc] | Item in range (a or b or c) |
| [^abc] | Not in range (not a or b or c) |
| \s | White space |
| 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 |
| \ | Escape character |
| [:punct:] | Any punctuation symbol |
| [:space:] | Any space character |
| [:blank:] | Space or tab |