$ perl -Mstrict -Mwarnings -de 1

Loading DB routines from perl5db.pl version 1.39_09
Editor support available.

Enter h or 'h h' for help, or 'man perldebug' for more help.

main::(-e:1):	1
  DB<1> $_ = 'ActionLogs.1.1998.xml'                                                                                    

  DB<2> x /\.(\d+)/g                                                                                                    
0  1
1  1998
  DB<3> x /(\d+)\./g                                                                                                    
0  1
1  1998
  DB<4> $_ = 'ActionLogs.1.2.3.4.5.6.7.8.9.xml'                                                                         

  DB<5> x /\.(\d+)/g                                                                                                    
0  1
1  2
2  3
3  4
4  5
5  6
6  7
7  8
8  9
  DB<6> x /(\d+)\./g                                                                                                    
0  1
1  2
2  3
3  4
4  5
5  6
6  7
7  8
8  9
  DB<7> q