September 2017
Beginner
402 pages
9h 52m
English
There is a set of predefined character classes that start with a backslash and have one letter, either lowercase or uppercase. Uppercase versions are opposite to their lowercase and negate the set of the characters, with which a character class matches. The following table contains an overview of the backslashed character classes:
| Character class | Negated class | Description |
| \s | \S | Whitespace |
| \t | \T | Tabulation |
| \h | \H | Horizontal space |
| \v | \V | Vertical space |
| \n | \N | New line |
| \d | \D | Digit |
| \w | \W | Word character |
Now we will examine all the character classes in detail.