isalnum
- Alphanumeric character predicate
isalpha
- Alphabetic character predicate
isascii
- ASCII character predicate
iscntrl
- Control character predicate
isdigit
- Decimal digit predicate
islower
- Lower-case character predicate
isprint
- Printable character predicates (isprint, isgraph)
ispunct
- Punctuation character predicate
isspace
- Whitespace character predicate
isupper
- Uppercase character predicate
isxdigit
- Hexadecimal digit predicate
toascii
- Force integers to ASCII range
tolower
- Translate characters to lower case
toupper
- Translate characters to upper case
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