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From gawk documentation :

Try :
awk '{ if($0 ~ /^http:\/\/[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]{1,3}\.[0-9]\{1,3\}(:[0-9]\{1,5\})?/) print $0}' f7


I test the original awk command with some...