re = /^\d+(?:\.[a-zA-Z]?\d+)*$/m
str = '123.123.123.132
123123213123
123.a123.b123.123
123.aa1.bb12
'
# 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