pl@nereida:~$ perl -wde 0

Loading DB routines from perl5db.pl version 1.28
Editor support available.

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

main::(-e:1):   0
DB<1> "a" =~ /(a)|(b)/; print ((scalar @-)."\n"); print ((scalar @+)."\n")
2
3