Functions
 FunctionDescription
 isalnum AVM-only Test for an alphanumeric character.
 isalpha AVM-only Test for an alphabetic character.
 isascii AVM-only Test for a 7-bit US-ASCII character.
 isblank AVM-only Test for a blank character.
 iscntrl AVM-only Test for a control character.
 isdigit AVM-only Test for a decimal digit.
 isgraph AVM-only Test for a visible character.
 islower AVM-only Test for a lowercase letter.
 isprint AVM-only Test for a printable character.
 ispunct AVM-only Test for a punctuation character.
 isspace AVM-only Test for a white-space character.
 isupper AVM-only Test for an uppercase letter.
 isxdigit AVM-only Test for a hexadecimal digit.
 toascii AVM-only Translate an integer to a 7-bit ASCII character.
 tolower AVM-only Transliterate uppercase characters to lowercase.
 toupper AVM-only Transliterate lowercase characters to uppercase.