Regex validation + custom error messaging

This data hook will allow you to apply regex strings to multiple fields for validation purposes, while also allowing you to configure a custom error message in the event the field values are invalid.

const FIELDS = {
  'employerId': {
    'regex': /^\d{9}$/,
    'message': 'Employer Id must be exactly 9 digits'
  },
  'memberId': {
    'regex': /^[a-zA-Z0-9]{5}\d{4}$/,
    'message': 'Member ID must be exactly 9 characters'
  },
  'lastName': {
    'regex': /^.{1,20}$/,
    'message': 'Last Name must be 20 characters or less'
  },
  'firstName': {
    'regex': /^.{1,20}$/,
    'message': 'First Name must be 20 characters or less'
  },
  'middleInitial': {
    'regex': /^[a-zA-Z]{0,1}$/,
    'message': 'Middle Initial can only be 1 letter'
  }
}

module.exports = async ({recordBatch, session, logger}) => {
  recordBatch.records.forEach((record) => {
    Object.keys(FIELDS).forEach(field => {
      if (FIELDS[field].regex.test(record.get(field)) === false) {
        record.addError(field, FIELDS[field].message)
      }
    })
  }) 
}

This example is formatted for Data Hooks 3.0. For more information about Data Hooks 3.0, click here.