Test if a value is a string.

Test if a value is an empty string.

Test if a value is an array of strings.

Test whether a string contains only hexadecimal digits.

Test whether a string contains only numeric digits.

Test if a value is a binary string.

Test whether a character belongs to the ASCII character set and whether this is true for all characters in a provided string.

Test if a value is an anagram.

Test whether a string contains only alphanumeric characters.

Test if a value is an alphagram.

Test if a value is a blank string.

Test whether a string contains only white space characters.