fails:MatchData#[Symbol] returns the corresponding named match when given a Symbol
fails:MatchData#[Symbol] returns the corresponding named match when given a String
fails:MatchData#[Symbol] raises an IndexError if there is no named match corresponding to the Symbol
fails:MatchData#[Symbol] raises an IndexError if there is no named match corresponding to the String
fails:MatchData#[Symbol] returns matches in the String's encoding
