Possible typo or cut'n'paste error in the snippet (or, some transformation not mentioned), but as shown, the initial match, $_ =~ /fwlogsum\.(\d+)\w+/;
does not match on anything in the data.
try: $_ =~ /fwlog\.(\d+)\w+/; instead...
and then note that (unless you can guarantee that the data will never contain more than one month) this node is not helpful in the sense of providing a safe approach for production use.
There are MANY good suggestions re parsing dates above.
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