Function is_encoded 

pub fn is_encoded(src: impl AsRef<[u8]>, mask: Bitmask) -> bool

Checks if this string contains any unencoded characters

Example

let string = "Dovahkiin, Dovahkiin, naal ok zin los vahriin, wah dein vokul mahfaeraak ahst vaal!";
// contains comma = false
assert!(!is_encoded(&string, Bitmask::URI_COMPONENT));