vi search and replace with regular expressions

in vi, to search and replace:

:%s/search_phrase/replace_phrase/

with regular expressions:

.* matches one or more characters

so to get rid of the first two columns, separated by spaces

ie

2395 4586 3496
146434 6 3945

:%s/.* .* //

so it becomes:

3496
3945

or you could also do
:%s/[0-9]* [0-9]* //