[Orgmode] From formatted to table

[andrea Crotti]

I have for example a table where

| one thing     | dsjfls   |
| two things    | dslkjfls |
| three abc dej | dsf      |

And I would like to get

| one   | thing   | dsjfls   |
| two   | things  | dslkjfls |
| three | abc dej | dsf      |

I tried some simple substitutions but substituting all the spaces in
the region selected will cause problems elsewhere.  I would need to
substitute " " only in one column, is that possible?