Get string between 2 characters that repeats several times in sql server

Question

I need to extract multiple strings between 2 specific characters that repeats several times in a row. for example; these are 2 rows from my table:

id myString
         


        

Answer 1

If the string always follows the repeating pattern of '..(..)' one method to solve this uses a CSV Splitter function by Jeff Moden, replacing the second delimiter with the first delimiter, and getting only the second sets using modulo (%):

select 
    Id
 , myString = x.item
from t
  cross apply (
    select Item = ltrim(rtrim(i.Item))
      from [dbo].[delimitedsplit8K](replace(t.mystring,')','('),'(') as i
      where ItemNumber%2=0
      ) x

test setup: http://rextester.com/DAI48471

Added example input of 3,'jjj(kkk)ll(mmm)n(ooooo)pp(qq)rr'

returns:

+----+----------+
| Id | myString |
+----+----------+
|  1 | bb       |
|  1 | ffffd      |
|  2 | ff       |
|  2 | hhh      |
|  3 | kkk      |
|  3 | mmm      |
|  3 | ooooo    |
|  3 | qq       |
+----+----------+

splitting strings reference:

• Tally OH! An Improved SQL 8K “CSV Splitter” Function - Jeff Moden
• Splitting Strings : A Follow-Up - Aaron Bertrand
• Split strings the right way – or the next best way - Aaron Bertrand
• string_split() in SQL Server 2016 : Follow-Up #1 - Aaron Bertrand