| ^ | Matches the beginning of a line |
| $ | Matches the end of the line |
| . | Matches any character |
| \s | Matches whitespace |
| \S | Matches any non-whitespace character |
| * | Repeats a character zero or more times |
| *? | Repeats a character zero or more times (non-greedy) |
| + | Repeats a character one or more times |
| +? | Repeats a character one or more times (non-greedy) |
| [aeiou] | Matches a single character in the listed set |
| [^XYZ] | Matches a single character not in the listed set |
| [a-z0-9] | The set of characters can include a range |
| ( | Indicates where string extraction is to start |
| ) | Indicates where string extraction is to end |