Single Character
| Special Character | RE | Description |
|---|---|---|
| New line | \n | New line |
| Next page | \f | Form feed |
| Return | \r | return |
| space | \s | space |
| table | \t | table |
| Vertical table | \v | Vertical tab |
| back | [\b] | Backspace |
Multi-Character
| Special Character | RE | Description |
|---|---|---|
| Any character except new line | . | |
| [0-9], single number | \d | digit |
| Except [0-9] | \D | Not digit |
| [A-Z,a-z,0-9] | \w | Word |
| except [A-Z,a-z,0-9] | \W | Not word |
| Matches Unicode whitespace characters | \s | |
| any character which is not a whitespace character | \S | Not space |
loop and repeat
0|1
? Means match 0 or 1 character. Like color and colour, our regular expression is: /colou?r/
>=0
Use *, means 0 or infinity character(s).
>=1
+