Called after this CmdOption has been matched and value has been parsed.
Attempt to match and process command-line option at position 'index' in 'args'.
Parse a value from a single arg
Parse a value from a single arg
After we have found a match, request that argument(s) to command-line option be parsed.
After we have found a match, request that argument(s) to command-line option be parsed. Return the index position that should be processed next. This method allows one option to possibly consume multiple args, (in contrast with parseValue(String).)