Your $search_string would look something like:
"C04*040716*.ORD_API"
i.e. look for "C0", 0 or more "4"s, "04071", 0 or more "6"s, any single character ("."), then "ORD_API".
What you probably need is something like:
my $search_string = "C04.*?".substr($year,2,2).$month.$day.".*\.ORD_AP
+I";
Try
perlre. "regex" is short for Regular Expression.
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