char *str = "Preved!!!";
char *pat = "C*";

dSP;
PUTBACK;
int n = unpackstring(pat, pat + 2, str, str + strlen(str), 0);
SPAGAIN;

AV*   array2 = POPs;

printf("%d, %d\n", n, av_len(array2));

=>>>

9, 44939024