One way to do it.

  DB<1> $_ = 'ActionLogs.1.2.3.4.5.6.7.8.9.xml'

  DB<2> x split ' ', tr/.[a-zA-Z]/ /dr
0  1
1  2
2  3
3  4
4  5
5  6
6  7
7  8
8  9
  DB<3>
[download]

Update: The brackets are unnecessary; tr/.a-zA-Z/ /dr works just as well.