re = /^(((25[0-5])|(2[0-4]?\d?)|(1\d{1,2}?)|([1-9]\d?)|([1-9]))\.){3}((25[0-5])|(2[0-4]?\d?)|(1\d{1,2}?)|([1-9]\d?)|([1-9]))$/m
str = '111
000
256
333
222
267
1.1.1.1
255.255.255.255
000.000.000.000
0.0.0.0
100.28.28.1
'
# Print the match result
str.scan(re) do |match|
puts match.to_s
end
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html