anchor.diff:                  input#order_value(
                     name='value', type='number', step='any'
                     ng-model='order.second', ng-change='calc_first()'
  -                  ng-pattern='/^[0-9.]+$/', required)
  +                  rp-amount, required)
                   .add-on {{order.second_currency}}
                 .errorGroup(rp-errors='value')
  -                .error(rp-error-on='pattern') Not a valid value.
  +                .error(rp-error-on='rpAmount') Not a valid value.
             .message(ng-show='orderForm.$valid')
               | You are wanting to {{order.type}}
               | {{order.first_amount | rpamount:{precision: 10} }} {{order.first_amount | rpcurrency}}
  
positive.code:                 input#order_price(
                    name='price', type='number', step='any'
                    ng-model='order.price', ng-change='calc_second()'
                    ng-pattern='/^[0-9.]+$/', required)
                  .add-on {{order.second_currency}}
                .errorGroup(rp-errors='price')
                  .error(rp-error-on='pattern') Not a valid price.
                  .error(rp-error-on='required') Required
                    | You need more XRP for this transaction
              .sign =
  
negative.code:                 input#order_amount(
                    name='amount', type='number', step='any'
                    ng-model='order.first', ng-change='calc_second()'
                    rp-amount, required)
                  .add-on {{order.first_currency}}
                .errorGroup(rp-errors='amount')
                  .error(rp-error-on='rpAmount') Not a valid amount.
                  .error(rp-error-on='required') Required
              .sign x
              .value-field
  