Replacing multiple strings with the same string replacement - sql-server

Question

Been looking all over for this and I don't think nested replace is the answer. I have a list of email address that I need to keep unique, but I need to make them all fake for testing. So my idea was to just replace the '.com', '.net', '.org' and so on to '.mydomain.com'. But there are a LOT of endings in total.
I realized I could just remove the # and add '#mydomain.com' to the end, but now I also want to figure out how to solve this particular problem.
Instead of doing:
BEGIN TRANSACTION;
UPDATE Customer
SET Email=REPLACE(Email, '.com','.mydomain.com')
where email not like '%.mydomain.com%'
COMMIT TRANSACTION;
for each case '.com', '.net', '.org'........
is there a way to say, replace all of these ('.com', '.net', '.org') with '.mydomain.com' in one statement?
something like this.
BEGIN TRANSACTION;
UPDATE Customer
SET Email=REPLACE(Email, (in ('.com', '.net', '.org')),'.mydomain.com')
where email not like '%.mydomain.com%'
COMMIT TRANSACTION;

Answer 1

Following the KISS principle, just run 3 separate queries.
update Customer set email = replace(email, '.com', '.mydomain.com') where email not like '%.mydomain.com%';
update Customer set email = replace(email, '.net', '.mydomain.com') where email not like '%.mydomain.com%';
update Customer set email = replace(email, '.org', '.mydomain.com') where email not like '%.mydomain.com%';

Answer 2

I think something like this should work.
UPDATE Customer
SET Email (case
where CHARINDEX(Email, '.com') > 0 then REPLACE(Email, '.com','.mydomain.com')
where CHARINDEX(Email, '.net') > 0 then REPLACE(Email, '.net','.mydomain.com')
where CHARINDEX(Email, '.org') > 0 then REPLACE(Email, '.org','.mydomain.com')
end)
where email not like '%.mydomain.com%'
May CHARINDEX can be replaced by any function that verify if a string contain a substring.

Answer 3

You can use an UPDATE ... FROM to join a derived table of the TLDs you want to replace. (You can also join a "real" table with the TLDs if you have one.)
UPDATE c
SET c.email = replace(c.email, concat('.', tld.tld), '.mydomain.com')
FROM customer c
INNER JOIN (VALUES ('com'),
('org'),
('net')) tld (tld)
ON c.email LIKE concat('%.', tld.tld)
WHERE c.email NOT LIKE '%.mydomain.com';
db<>fiddle
It won't solve the problem though that, if a substring that matches a TLD is in the string somewhere else as at the end, this substring also gets replaced. But probably that's not an issue here.

Answer 4

Another solution is to have nested replace statements:
update Customer set email = replace(replace(email, '.com', '.mydomain.com'), '.net', '.mydomain.com')
You can go on to as many levels as you want. You can even generate the replace statement dynamically.
Another possible solution is to use a stored procedure.