code: def remove_pos_arg_placeholders(alias_command):
      
      # Boundary index is the index at which named argument or positional argument starts
      split_command = shlex.split(alias_command)
      boundary_index = len(split_command)
      for i, subcommand in enumerate(split_command):
          if not re.match('^[a-z]', subcommand.lower()) or i > COLLISION_CHECK_LEVEL_DEPTH:
              boundary_index = i
              break
  
      return ' '.join(split_command[:boundary_index]).lower()
docs: Remove positional argument placeholders from alias_command.
  
      Args:
          alias_command: The alias command to remove from.
  
      Returns:
          The alias command string without positional argument placeholder.