| * | Wildward for multiple letters in a row | |
| ? | Wildcard for a single letter | |
| [abc] | Stands for letter a, b, or c | |
| [^abc] | Exclude letters a, b, or c | |
| [a-g] | Stands for letters a to g | |
| [a-z&&[^efg]] | Letters a to z but not e,f,g | |
| X|Y | Word X or Word Y | |
| (X) | Group word X | |
| ^ | Start of a character-string | |
| $ | End of a character-string |