You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: dialog_field_validation.rb
    path of file: ./repos/manageiq/app/models/miq_request_workflow
    
    the code of the file until where you have to start completion: # These methods are available for dialog field validation, do not erase.
module MiqRequestWorkflow::DialogFieldValidation
  def validate_tags(field, values, _dlg, fld, _value)
    selected_tags_categories = Array.wr
    
  def validate_regex(_field, _values, dlg, fld, value)
    regex = fld[:required_regex]
    return _("%{name} is required") % {:name => required_description(dlg, fld)} if value.blank?

    unless value.match(regex)
      error = _("%{name} must be correctly formatted") % {:name => required_description(dlg, fld)}
      error << _(". %{details}") % {:details => fld[:required_regex_fail_details]} if fld[:required_regex_fail_details]

      error
    end