pl@nereida:~/Lperltesting$ ./offsetsin5_10.pl
abab
expr:
@- = (0, , , , 0, 1)     6 items
@+ = (2, , , , 1, 2)     6 items

expr:
@- = (0, 0, , , 2, 3)    6 items
@+ = (4, 2, , , 3, 4)    6 items

main:
@- = (0, 0, 2)           3 items
@+ = (4, 2, 4, , , )     6 items

matches: (abab)