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Finds the value a subdomain value from a valid URL. Input values must be of URL or String type.

In this implementation, a subdomain value is the first group of characters in the URL after any protocol identifiers ( http:// or https://, for example).

For more information, see Structure of a URL.
You can also extract domain values by function. See DOMAIN Function.

URL literal example:

subdomain('http://www.example.com')

Output: Returns the value: www.

subdomain('http://www.exampl.e.com')

Output: Returns the value: www.exampl.

Column reference example:

subdomain(myURLs)

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

subdomain(column_url)

Argument	Required?	Data Type	Description
column_url	Y	string	Name of column or String or URL literal containing the sub-domain value to extract

column_url

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

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

Required?	Data Type	Example Value
Yes	String literal or column reference (URL)	`http://www.example.com`

column_url

Example - Domain, Subdomain, Host, and Suffix functions