Function nom::character::is_alphanumeric
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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);