MySQL Insert with functionality similar to Window's default file naming - mysql

Question

I have a table with a name column. Initially a name is not added to the table but I would like to add a default name when a new row is inserted, much like window's functionally when creating a new file. I'm trying to figure out how to query the number which is suppose to be next in the sequence.
For example, if my table looks like this:
id | name
==========
1 | New Name (1)
2 | real name
3 | New Name
The next inserted row's name should be "New Name (2)". If my table looks like this:
id | name
==========
1 | New Name (2)
2 | real name
or this:
id | name
==========
1 | another name
2 | real name
The next inserted row's name should be "New Name". If my table looks like this:
id | name
==========
1 | New Name (2)
2 | real name
3 | New Name
4 | New Name (3)
The next inserted row's name should be "New Name (1)". Thus far I was able to create the query to get the existing numbers ("New Name" = 0)
SELECT SUBSTRING_INDEX(SUBSTR(d.name,INSTR(d.name,'(') + 1), ')', 1)
FROM data d
WHERE d.widget_name REGEXP '^New[[:space:]]Name[[:space:]]\\([[:digit:]]\\)$'
UNION
SELECT 0
FROM data d
WHERE d.name REGEXP '^New[[:space:]]Name$'
Now I need a way to to turn that list of numbers to a single number which will indicate whats the next default name enumeration. I've tried using NOT EXISTS from this question but I couldn't figure out how to use the code above both in FROM and the WHERE.
I also tried to do this by creating a row_num functionality using a_horse_with_no_name's answer in this question. Assuming num_data is the result of the query(trying to keep it clean) table and it's column name is name_num:
SELECT IFNULL(row_number, (SELECT IFNULL(MAX(name_num),0)
FROM num_data))
FROM (SELECT #rownum:=#rownum + 1 AS row_number, t.*
FROM (num_data) t,
(SELECT #rownum := 0) r) gap_table
WHERE gap_table.row_number <> gap_table.widget_num
ORDER by row_number
LIMIT 1;
But that didn't seem to get it right too.

Answer 1

If you want the next name for a given name, I would expect the query to look like this:
select (case when count(*) = 0 then $name
else concat($name, '(',
max(substring_index(name, ' (', -1) + 0) + 1,
')')
end)
from num_data
where name rlike concat($name, ' [(][0-9]+[)]' or
name = $name;
Here is a SQL Fiddle demonstrating it.
This assumes that name being tested is provided by a parameter called $name.
Note: The above query generates the new name. It should be obvious how to get the next number in sequence.

Answer 2

This did the trick, thanks to #GorodonLinoff's answer:
select (case when count(*) = 0 then '$name'
when max(name = '$name') = 0 then '$name'
when max(name = '$name(1)') = 0 then '$name(1)'
else concat('$name', '(', max(substring_index(name, '(', -1) + 0) + 1, ')')
end)
from data
where name rlike concat('$name', '[(][0-9]+[)]') or
name = '$name';