Hostname subdomains (subdomain)
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 column in the search window toolbar, then select the Hostname subdomains operation. You need to specify one argument:
The data type of the values in the new column is string.
The examples in this article use values in a data table generated from this CSV file. If you want to try the example for yourself, download the file and upload it to your domain clicking Data upload in the navigation pane. Name the new table
my.upload.sample.data and select Current date as Date parsing type. Learn more about uploading data in Uploading log files.
After receiving the confirmation message, you can access the table from the Finder, selecting my → upload → sample → data. When you upload data from a file, all the information is included in a single column called message. To split the values into different columns, you can use the Split operation. Click Toggle Query Editor in the search window toolbar and paste the following LINQ query to save time:
select split(message, ";", 15) as Hostnames
my.upload.sample.data table, we want to get the subdomains of the hostnames in our Hostnames column. To do it, we will create a new column using the Hostname subdomains operation.
The arguments needed to create the new column are:
- Hostname - Hostnames column
Click Create column and you will see the following result:
How does it work in LINQ?
Use the operator
as... and add the operation syntax to create the new column. This is the syntax for the Hostname subdomains operation:
You can copy the following LINQ script and try the above example on the
my.upload.sample.data table. As said above, keep in mind that you must download and upload this lookup file to your Devo domain.
from my.upload.sample.data select split(message, ";", 15) as Hostnames select subdomain(Hostnames) as subdomains