Ruby on Rails

How can I refactor this coordinate validation routine so that I can use
this method with other fields of the same type, for instance, with
"full_last_position" and also maintain the cleanliness of the code and
avoiding repeating method code?

class Provider < ActiveRecord::Base
  include UtilsModule
  attr_accessor :full_target_area_coordinate, :full_last_position # this
field validates and saves coordinate

  validate :full_target_area_coordinate, :is_valid_coordinate?

  def is_valid_coordinate?  # searches local geo_codes table for valid
zip
    coord = self.full_target_area_coordinate.to_str
    match = coord.match(/^(-?\d{1,2}\.\d{6}),\s*(-?\d{1,2}\.\d{6})$/)
    if match.nil?  # invalid format
      errors.add(:target_area_coordinate, :invalid)
      return false
    end

    self.target_area_coordinate =
UtilsModule.convert_coordinate(self.full_target_area_coordinate)
    return true
  end

end

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