Special character classes

• \w
• \d
• \s
• ^
• $

| Expression | Meaning | Usage | | \w | Word characters: [a-zA-Z0-9_] | \w+ or [\w#-]+ | | \d | Digits: [0-9] | | | \s | [\f\t\n\r ] form-feed, tab, newline, carriage return and SPACE | | | \W | [^\w] | | | \D | [^\d] | | | \S | [^\s] | | | [:class:] | POSIX character classes (alpha, alnum...) | [:alpha:]+ or [[:alpha:]#-]+ | | \p{...} | Unicode definitions (IsAlpha, IsLower, IsHebrew, ...) | \p{IsHebrew}+ or [\p{IsHebrew}#!-] | | \P{...} | Negation of Unicode character class | |

See also perldoc perlre and perldoc perluniintro.