This validates a field for currency for dollar and cents. Ex: 42.50

currencyValidation.html

<script>
  
  lp.jQuery(function($) {
  
    var ruleID = 'currency';
    var field = 'money_field';
    var message = 'Please enter a valid currency';
  
    var rules = module.lp.form.data.validationRules[field];
  
    $.validator.addMethod(ruleID, function(value, field) {
  
      var valid = ( /^\d*(\.\d{0,2})?$/.test(value) );
  
      return valid || (!rules.required && !value);
    }, message);
  
    rules[ruleID] = true;
  
  });

</script>