osem-fcy/app/views/admin/emails/custom_email.html.haml

.row
  .col-md-6.col-md-offset-2
    .panel.panel-default
      .panel-heading
        %h3.panel-title
          Send an email
      .panel-body
        %p
          %b Select/Enter Emails
        = text_field_tag :to, '', class: 'form-control', id: 'admin_email_to'
        %br
        %p.text-right
          = link_to 'Send Email', '', class: 'btn btn-primary'

  :javascript
    $(document).ready(function() {
      var $select = $('#admin_email_to').selectize({
        delimiter: ',',
        persist: true,
        plugins: ['remove_button'],
        labelField:  'item',
        valueField:  'item',
        sortField:   'item',
        searchField: 'item',
        create: function(input) {
          if (!/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(input)){
            return {}
          }
          return {
            item: input
          }
        }
      })
    })