You should check whether the match succeeds at all.

if (/\-+ [A-Za-z]{3} (.*?) (.*?) (.*?)\:(.*?)\:(.*?) (\d+)::(\d+)::Lau
+nching the JVM with following options/) {
    ...
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Also, use hashes and sprintf to format the numbers and convert month names:

# Declaration
my $m = 1;
my %MONTH = map { $_ => $m++ } qw( Jan Feb Mar Apr May ... );

# Later in the code:
$month = sprintf '%02d', $MONTH{$1};
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