Thread: Extract Domain Names Using sed

i have several large text files around million domain names. want create new text file unique domain names in.

i've got far:

code:

sed -nr "s|(http://)?(www\.)?([^.]*)\.(.*\.?)*|\3|p" filename

test case:

code:

google.com.tk/1/2/3/ www.google.co.uk.se google.co.au www.google.co.uk.se/1/2/ m.google.com http://www.google.com/au

above command produces:

google
google
google
google
m
google

i want produce:

google.com.tk
google.co.uk.se
google.co.au
google.co.uk.se
m.google.com
google.com

code:

sed -nr "s|(http://)?(www\.)?([^/]+).*|\3|p" filename

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