Hostname subdomains (subdomain)

[ 1 Description ] [ 2 How does it work in the search window? ] [ 3 How does it work in LINQ? ]

Description

Extract the subdomain from the hostnames in a given string field. A subdomain is a domain that is a part of a larger domain. For example, in www.devo.com, the subdomain is www.

Due to the inherent structure of certain hostnames, this operation will return empty values in cases such as "twitter-badges.s3.amazonaws.com". For those cases, it would be more appropriate to use the Hostname root prefix (rootprefix) operation.

How does it work in the search window?

Select Create field in the search window toolbar, then select the Hostname subdomains operation. You need to specify one argument:

Argument	Data type

Argument	Data type
Hostname ^mandatory	string

The data type of the values in the new field is string.

Example

In the my.upload.sample.data table, we want to get the subdomains of the hostnames in our Hostnames firld. To do it, we will create a new field using the Hostname subdomains operation.

The arguments needed to create the new field are:

Hostname - Hostnames field

Click Create field and you will see the following result:

How does it work in LINQ?

Use the operator select... as... and add the operation syntax to create the new column. This is the syntax for the Hostname subdomains operation:

subdomain(string)

Example

You can copy the following LINQ script and try the above example on the my.upload.sample.data table. Keep in mind that you must download CSV file above to your Devo domain.

from my.upload.sample.data
select split(message, ";", 15) as Hostnames
select subdomain(Hostnames) as subdomains