SED URL and IP defang

defang.sed

# replaces IP addresses with brackets around `.` :: 192[.]168[.]1[.]42
s/\([0-9]\{1,\}\)\.\([0-9]\{1,\}\)\.\([0-9]\{1,\}\)\.\([0-9]\{1,\}\)/\1[.]\2[.]\3[.]\4/g

# replaces all http(s) instances with hxxp(s)
s/http/hxxp/g

sed -f ./defang.sed ./<file_name> will output URLs and IP addresses as: 192[.]168[.]1[.]10 and hxxps://google.com

\( - sed beginning of lookup group
[0-9] - range of numbers between 0-9
\{1,\} - One or more instance of previous lookup
\) - sed close of lookup group
\1 - sed reference to first lookup group
\2 - sed reference to second lookup group... etc.