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Q&A about the site for those interested in the study of the fundamental nature of knowledge, reality, and existence

declare @test as table(str varchar(1000));

insert into @test values
('#Test#SQL#'),
('Test#SQL'),
('#Test#SQL'),
('Test#SQL # ');

select case when left(str, 3) = ' # ' and right(str, 3) = ' # '
then left((right(str, len(str) - 3)), len((right(str, len(str) - 3))) - 3)
when left(str, 3) = ' # ' and right(str, 3) <> ' # '
then right(str, len(str) - 3)
when left(str, 3) <> ' # ' and right(str, 3) = ' # ' 
then left(str, len(str) - 1)
else str end as str
from @test;

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edited nov 26

created may 8 17 anonymous