Character classification Functions
| Function | Use |
| isalnum | Tests for alphanumeric character |
| isalpha | Tests for alphabetic character |
| isdigit | Tests for decimal digit |
| islower | Tests for lowercase character |
| isspace | Tests for white space character |
| isupper | Tests for uppercase character |
| isxdigit | Tests for hexadecimal digit |
| tolower | Tests character and converts to lowercase if uppercase |
| toupper | Tests character and converts to uppercase if lowercase |
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