In this implementation, a domain value is all data between 1) the protocol identifier (if present) and the sub-domain and 2) the trailing, top-level domain information (e.g. .com).

• For more information, see Structure of a URL .
• You can also extract subdomain values by function. See SUBDOMAIN Function.

URL literal examples:

Output: Returns the value example. 

Output: Returns the value e. 

Column reference example:

Output: Returns the domain values extracted from the myURLs column. 

column_url

Name of the column or URL or String literal whose values are used to extract the domain value.

• Missing input values generate missing results.
• Multiple columns and wildcards are not supported.

Example - Filter out internal users

Here is some example web visitor information, including the name of the individual and the referring URL. You would like to filter out the internal users, whose referrer values include test-value.

Transformation:

The referrrer values include test-value as a non-domain value and varying URLs from the test-value.com domain. So, you should use the DOMAIN function to parse only the domain versions of these values. The following evaluates the Referrer column values for the test-value domain and generates true/false answers in a new column accordingly:

Now that these values are flagged, you can filter out the internal names:

Results:

Example - Domain, Subdomain, Host, and Suffix functions