| REGULAR EXPRESSIONS | ||
| . | = | match any character |
| \w | = | a word character |
| \s | = | a whitespace character |
| \d | = | a number 0-9 |
| \b | = | a word boundary |
| ^ | = | beginning of a line |
| $ | = | end of a line |
| xy|z | = | match xy OR z |
| x? | = | match zero or one x character |
| x* | = | match zero or more x characters |
| x+ | = | match one or more x characters |
| x{3} | = | match x three times |
| x{3,} | = | match x three or more times |
| x{3,5} | = | match x three to five times |
| [xyz] | = | match x, y OR z |
| [^xyz] | = | exclude x, y AND z |