How to sort on column for rows containing a certain word

Question

I want to sort on a certain column only for rows containing a certain word. I don\'t want to see rows not containing that word. For example I have this text file:

Answer 1

2 vim commands:

:v/sdf/d
:sort n /[^[:digit:]]*/

• first deletes all lines that do not contain 'sdf'
• second sorts numbers ignoring non-numbers