DOMAIN Function

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

NOTE: When the DOMAIN function parses a multi-tiered top-level domain such as co.uk, the output is the first part of the domain value (e.g. co). To return other parts of the domain information, you can use the HOST function. See HOST Function.

Basic Usage

URL literal examples:

derive type:single value:DOMAIN('http://www.example.com' ) as: 'myDomain'

Output: Generates a column containing the value example.

derive type:single value:DOMAIN('http://www.exampl.e.com' ) as: 'myDomain'

Output: Generates a column containing the value e.

Column reference example:

derive type:single value:DOMAIN(myURLs) as: 'myDomain'

Output: Generates the new myDomain column containing the domain values extracted from the myURLs column.

Syntax and Arguments

derive type:single value:DOMAIN(column_url)

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

For more information on syntax standards, see Language Documentation Syntax Notes.

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.

Usage Notes:

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

Examples

Tip: For additional examples, see Common Tasks.

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.

Name	Referrer
Joe Guy	http://www.example.com
Ian Holmes	http://www.test-value.com/support
Nick Knight	http://www.test-value.com
Axel Adams	http://www.example.com
Teri Towns	http://www.example.com/test-value

Transform:

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:

derive type:single value:IF(DOMAIN(Referrer)=='test-value',true,false) as:'isInternal'

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

delete row:(isInternal == 'true')

Results:

Name	Referrer	isInternal
Joe Guy	http://www.example.com	false
Axel Adams	http://www.example.com	false
Teri Towns	http://www.example.com/test-value	false

Example - Domain, Subdomain, Host, and Suffix functions

This examples illustrates how you can extract component parts of a URL using the following functions:

DOMAIN - extracts the domain value from a URL. See DOMAIN Function.
SUBDOMAIN - extracts the first group after the protocol identifier and before the domain value. See SUBDOMAIN Function.
HOST - returns the complete value of the host from an URL. See HOST Function.
SUFFIX - extracts the suffix of a URL. See SUFFIX Function.
URLPARAMS - extracts the query parameters and values from a URL. See URLPARAMS Function.
FILTEROBJECT - filters an Object value to show only the elements for a specified key. See FILTEROBJECT Function.

Source:

Your dataset includes the following values for URLs:

URL
www.example.com
example.com/support
http://www.example.com/products/
http://1.2.3.4
https://www.example.com/free-download
https://www.example.com/about-us/careers
www.app.example.com
www.some.app.example.com
some.app.example.com
some.example.com
example.com
http://www.example.com?q1=broken%20record
http://www.example.com?query=khakis&app=pants
http://www.example.com?q1=broken%20record&q2=broken%20tape&q3=broken%20wrist

Transform:

When the above data is imported into the application, the column is recognized as a URL. All values are registered as valid, even the IPv4 address.

To extract the domain and subdomain values:

derive type:single value: DOMAIN(URL) as: 'domain_URL'

derive type:single value: SUBDOMAIN(URL) as:'subdomain_URL'

derive type:single value: HOST(URL) as:host_URL'

derive type:single value: SUFFIX(URL) as:'suffix_URL'

You can use the Alteryx® pattern in the following transform to extract protocol identifiers, if present, into a new column:

extract col:URL on:`{start}%*://`

To clean this up, you might want to rename the column to protocol_URL.

To extract the path values, you can use the following regular expression:

NOTE: Regular expressions are considered a developer-level method for pattern matching. Please use them with caution. See Text Matching.

extract col: URL on: /[^*:\/\/]\/.*$/

The above transform grabs a little too much of the URL. If you rename the column to path_URL, you can use the following regular expression to clean it up:

extract col:path_URL on:/[!^\/].*$/

Drop the path_URL column and rename the path_URL1 column to the dropped one. Then:

derive type:single value: URLPARAMS(URL) as: 'urlParams'

If you wanted to just see the values for the q1 parameter, you could add the following:

derive type:single value: FILTEROBJECT(urlParams,'q1') as: 'urlParam_q1'