I have set the dicts’ keys domain to an empty string “”. I am checking if the var field for dict key ssluser is defined, and if so, I then need to fill in the email domain key data extracted from that provided user value.

{% 
  set sslusers= [
    {      
      'ssluser': SSL_VPN_User01,
      'sslusercred': SSL_USER_CRED01,
      'index': 0,
      'domain': ""
    },
    {
      'ssluser': SSL_VPN_User02,
      'sslusercred': SSL_USER_CRED02,
      'index': 1,
      'domain': ""
    },
    {     
      'ssluser': SSL_VPN_User03,
      'sslusercred': SSL_USER_CRED03,
      'index': 2,
      'domain': ""
    },
    {   
      'ssluser': SSL_VPN_User04,
      'sslusercred': SSL_USER_CRED04,
      'index': 3,
      'domain': ""
    },
    {      
      'ssluser': SSL_VPN_User05,
      'sslusercred': SSL_USER_CRED05,
      'index': 4,
      'domain': ""
    },
    {
      'ssluser': SSL_VPN_User06,
      'sslusercred': SSL_USER_CRED06,
      'index': 5,
      'domain': ""
    },
    {     
      'ssluser': SSL_VPN_User07,
      'sslusercred': SSL_USER_CRED07,
      'index': 6,
      'domain': ""
    },
    {   
      'ssluser': SSL_VPN_User08,
      'sslusercred': SSL_USER_CRED08,
      'index': 7,
      'domain': ""
    },
    {      
      'ssluser': SSL_VPN_User09,
      'sslusercred': SSL_USER_CRED09,
      'index': 8,
      'domain': ""
    },
    {
      'ssluser': SSL_VPN_User10,
      'sslusercred': SSL_USER_CRED10,
      'index': 9,
      'domain': ""
    }
  ] 
%}

The jinja block am I trying to get working to do this:

{%- for item in sslusers if item.ssluser is defined %}
    {% set domain_value_old = item.ssluser['domain'] %}
    {% for key, value in item.items() %}
        {% if key == 'domain' %}
            {% set domain_value_new = value.split('@') | last %}
            <update dicts in the list with the new value only for 'domain' key>
        {% endif %}
     {% endfor %}
{% endfor %}

I am stuck on the line under set domain_value_new.... For context, I am using this in a cli script that is a jinja template that runs on network appliances.