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DOMAIN Function

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).

注意

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.

Wrangle vs. SQL: This function is part of Wrangle, a proprietary data transformation language. Wrangle is not SQL. For more information, see Wrangle Language.

Basic Usage

URL literal examples:

domain(&apos;<span class="nolink">http://www.example.com</span>&apos;)

Output: Returns the value example.

domain(&apos;<span class="nolink">http://www.exampl.e.com</span>&apos;)

Output: Returns the value e.

Column reference example:

domain(myURLs)

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

Syntax and Arguments

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

提示

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

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:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

if(domain(Referrer)=='test-value',true,false)

Parameter: New column name

'isInternal'

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

Transformation Name

Filter rows

Parameter: Condition

Custom formula

Parameter: Type of formula

Custom single

Parameter: Condition

(isInternal == 'true')

Parameter: Action

Delete matching rows

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 specialized functions for the URL data type.

Functions:

Item

Description

DOMAIN Function

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

SUBDOMAIN Function

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

HOST Function

Finds the host value from a valid URL. Input values must be of URL or String type and can be literals or column references.

SUFFIX Function

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

URLPARAMS Function

Extracts the query parameters of a URL into an Object. The Object keys are the parameter's names, and its values are the parameter's values. Input values must be of URL or String type.

FILTEROBJECT Function

Filters the keys and values from an Object data type column based on a specified key value.

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

Transformation:

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

To extract the domain and subdomain values:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

DOMAIN(URL)

Parameter: New column name

'domain_URL'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

SUBDOMAIN(URL)

Parameter: New column name

'subdomain_URL'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

HOST(URL)

Parameter: New column name

'host_URL'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

SUFFIX(URL)

Parameter: New column name

'suffix_URL'

You can use the Wrangle in the following transformation to extract protocol identifiers, if present, into a new column:

Transformation Name

Extract text or pattern

Parameter: Column to extract from

URL

Parameter: Option

Custom text or pattern

Parameter: Text to extract

`{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:

注意

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

Transformation Name

Extract text or pattern

Parameter: Column to extract from

URL

Parameter: Option

Custom text or pattern

Parameter: Text to extract

/[^*:\/\/]\/.*$/

The above transformation 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:

Transformation Name

Extract text or pattern

Parameter: Column to extract from

URL

Parameter: Option

Custom text or pattern

Parameter: Text to extract

/[!^\/].*$/

Delete the path_URL column and rename the path_URL1 column to the deleted one. Then:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

URLPARAMS(URL)

Parameter: New column name

'urlParams'

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

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

FILTEROBJECT(urlParams,'q1')

Parameter: New column name

'urlParam_q1'

Results:

For display purposes, the results table has been broken down into separate sets of columns.

Column set 1:

URL

host_URL

path_URL

www.example.com

www.example.com

example.com/support

example.com

/support

http://www.example.com/products/

www.example.com

/products/

http://1.2.3.4

1.2.3.4

https://www.example.com/free-download

www.example.com

/free-download

https://www.example.com/about-us/careers

www.example.com

/about-us/careers

www.app.example.com

www.app.example.com

www.some.app.example.com

www.some.app.example.com

some.app.example.com

some.app.example.com

some.example.com

some.example.com

example.com

example.com

http://www.example.com?q1=broken%20record

www.example.com

http://www.example.com?query=khakis&app=pants

www.example.com

http://www.example.com?q1=broken%20record&q2=broken%20tape&q3=broken%20wrist

www.example.com

Column set 2:

URL

protocol_URL

subdomain_URL

domain_URL

suffix_URL

www.example.com

www

example

com

example.com/support

example

com

http://www.example.com/products/

http://

www

example

com

http://1.2.3.4

http://

https://www.example.com/free-download

https://

www

example

com

https://www.example.com/about-us/careers

https://

www

example

com

www.app.example.com

www.app

example

com

www.some.app.example.com

www.some.app

example

com

some.app.example.com

some.app

example

com

some.example.com

some

example

com

example.com

example

com

http://www.example.com?q1=broken%20record

http://

www

example

com

http://www.example.com?query=khakis&app=pants

http://

www

example

com

http://www.example.com?q1=broken%20record&q2=broken%20tape&q3=broken%20wrist

http://

www

example

com

Column set 3:

URL

urlParams

urlParam_q1

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

{"q1":"broken record"}

{"q1":"broken record"}

http://www.example.com?query=khakis&app=pants

{"query":"khakis","app":"pants"}

http://www.example.com?q1=broken%20record&q2=broken%20tape&q3=broken%20wrist

{"q1":"broken record", "q2":"broken tape",

"q3":"broken wrist"}

{"q1":"broken record"}