reading from right to left from string find first special characters in sql code example

Example 1: sql right characters

-- For Oracle only

-- syntax 
SUBSTR(<main-string>,-<number-of-characters>)

-- example 
SUBSTR('Useless stuff',-9) -- OUTPUT: ess stuff

-- practical example
SELECT SUBSTR('Useless stuff',-9)
FROM DUAL;

Example 2: reading from right to left from string find first special characters in sql

DECLARE @strvalue varchar(20) = 'SDADH/SDKDS/SD/UIO-123/WEA/456'
SELECT REVERSE(SUBSTRING(REVERSE(@strvalue),0,CHARINDEX ('/',REVERSE(@strvalue))))