Answer by Nathan Skerl

You can also play with replace to "count" the number of characters like so:

declare @s varchar(15)
set @s = 'abc#def#ghi'

if (len(@s) - len(replace(@s, '#', ''))) > 1
begin
    print 'more than one found'
end else
begin
    print 'less than one found'
end


/* against table
select  *
from    dbo.YourTable
where   len(YourColumn) - len(replace(YourColumn, '#', ''))) > 1
*/