Question

I have a db with domains.
I need to pull the domains suffixes and create a list of those suffixes. (.com, .net, .org …)

I’ve found that regexp patterns may help me. The only thing I can’t make is to filter those domains based on the pattern + uniqueness, in order to get my list.

Here’s my query:
$qry="select * from domain where domain_name REGEXP '[[.period.]][a-z]+'";

How should I add the unique criteria to it?
Thank you.

UPDATE:
Here’s the working query:
SELECT DISTINCT SUBSTRING_INDEX(domain_name, '.', -1) FROM domains WHERE domain_name REGEXP '[[.period.]][a-z]+'

Answer 1

MySQL has no construct to substitute using regular expressions, or to access matching groups. So regular expressions likely won’t help you. Perhaps the SUBSTRING_INDEX function is more useful for you, as you can use that to extract the part after the final dot, using

SUBSTRING_INDEX(domain_name, '.', -1) AS tld