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    ([0-9]?\d\d?|2[0-4]\d|25[0-5])
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    (1?\d\d?|2[0-4]\d|25[0-5])
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    perl -nle 'print if s/((1?\d\d?|2[0-4]\d|25[0-5])\.){3}(?=\d+)/xxx.xxx
+.xxx./g'