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jhamfler/regexe

Last active October 16, 2019 09:15
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regexe
# IPv4 is inside a String
echo "address is 127.0.0.1 ." | grep -Eo '((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])'
# IPv4 string can only be an IPv4-address
echo "127.0.0.1" | grep -Eo '^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$'
# replace \n with " "
sed ':a;N;$!ba;s/\n/ /g'
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