How to extract this specific substring in SQL Server?

Question

I have a string with a specific pattern:

23;chair,red [$3]

i.e., a number followed by a semicolon, then a name followed by a left square br

Answer 1

If you need to split something into 3 pieces, such as an email address and you don't know the length of the middle part, try this (I just ran this on sqlserver 2012 so I know it works):

SELECT top 2000 
    emailaddr_ as email,
    SUBSTRING(emailaddr_, 1,CHARINDEX('@',emailaddr_) -1) as username,
    SUBSTRING(emailaddr_, CHARINDEX('@',emailaddr_)+1, (LEN(emailaddr_) - charindex('@',emailaddr_) - charindex('.',reverse(emailaddr_)) ))  domain 
FROM 
    emailTable
WHERE 
    charindex('@',emailaddr_)>0 
    AND 
    charindex('.',emailaddr_)>0;
GO

Hope this helps.