Set of functions for checking whether given string falls into
certain character class. These checks are locale-specific.
Constants
Functions
Returns the characters class of given parameter.
Character class is one of the constants declared in this library.
Tests if whole string consists of digits.
Tests if whole string consists of letters.
Tests if whole string consists of letters or digits.
Tests if whole string consists of lowercase characters.
Tests if whole string consists of unicode space characters.
Tests if whole string consists of uppercase characters.