Standard transformers

if transformer, aka conditional validation

switch transformer

foreach transformer

regex transformer (2 forms)

1. transform /aRegex/ into {validate: 'isTrue', value: /aRegex/, message: 'invalid format'}
2. transform {validate: /aRegex/} into {validate: 'isTrue', value: /aRegex/, message: 'invalid format'}

Note the main advantage of form #2 is that it allows you override error message (but you cannot do value override) {validate: /aRegex/, message: 'not acceptable!'}.

Technically, the transformer doesn’t know about message override. Message override is later processed in bcx-validation/src/standard-validator-wrap.js.