Function is_alphanumeric

pub fn is_alphanumeric(chr: u8) -> bool

Tests if byte is ASCII alphanumeric: A-Z, a-z, 0-9

Example

assert_eq!(is_alphanumeric(b'-'), false);
assert_eq!(is_alphanumeric(b'a'), true);
assert_eq!(is_alphanumeric(b'9'), true);
assert_eq!(is_alphanumeric(b'A'), true);