it gets quite easier (and faster) using Sort::Key::Natural: 
use Sort::Key::Natural 'natkeysort';

my @sorted =
  natkeysort { /src inside:(\d+\.\d+\.\d+\.\d+)/ 
                  ? $1
                  : '0.0.0.0' } @input;

[download]

In reply to Re^2: Sorting log files with IP addresses (duplicates) by salva
in thread Sorting log files with IP addresses (duplicates) by Secode

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