Sorting csv files on columns in vim

Nice one, it's actually very easy to sort a [comma or tab or whatever] separated file in vim on a certain column.
The following example

:sort n/\([^\t]*\t\)\{9\}

• sorts (:sort )
• a "column" containing *numbers* ( n )
• defined as anything which is no tab until a tab ( \([^\t]*\t\) )
• after this having occurred 9 times \{9\} == on the *10th* column.