#REGEX AREA, DO NOT CROSS
@whitespace "[\t\ ]+"
@uppercase_word "[A-Z]+"
@identifier "[a-zA-Z0-9#@!?%$&^_-]+" #
@number "[0-9]+"
@left_brace "\["
@right_brace "\]"
@memory_ref "&"
@addresses_separator ","
@assigment_operator "<="

@match_command  ~r{(#{@uppercase_word})#{@whitespace}
                  (
                  (?:#{@memory_ref}#{@number})                             |
                  (?:#{@left_brace}#{@number}#{@right_brace})              |
                  (?:#{@memory_ref}#{@left_brace}#{@number}#{@right_brace})
                  )?
                  (?:#{@addresses_separator}#{@whitespace}
                  (
                  (?:#{@number})                                           |
                  (?:#{@memory_ref}#{@number})                             |
                  (?:#{@left_brace}#{@number}#{@right_brace})              |
                  (?:#{@memory_ref}#{@left_brace}#{@number}#{@right_brace})
                  )
                  )?}

@match_label ~r{#{@identifier}:}
@match_assigment ~r{(#{@identifier})(?:#{@whitespace})?#{@assigment_operator}(?:#{@whitespace})?(#{@number})}

#END OF REGEX AREA