re = /ec2-(?:25[0-5]|2[0-4]\d|[0-1]?\d{1,2})(?:-(?:25[0-5]|2[0-4]\d|[0-1]?\d{1,2})){3}\.(?:eu|us|af|ap|ca|me|sa)-(?:west|central|south|north|(?:south|north)?east)-[1-9]{1,1}\.compute\.amazonaws\.com/m
str = 'ec2-54-189-171-120.us-east-1.compute.amazonaws.com
ec2-35-158-116-105.us-east-2.compute.amazonaws.com
ec2-13-210-58-232.us-west-1.compute.amazonaws.com
ec2-54-202-130-232.us-west-2.compute.amazonaws.com
ec2-52-40-225-119.af-south-1.compute.amazonaws.com
ec2-54-244-14-137.ap-east-1.compute.amazonaws.com
ec2-54-188-91-145.ap-south-1.compute.amazonaws.com
ec2-16-221-167-247.ap-northeast-1.compute.amazonaws.com
ec2-34-221-167-247.ap-northeast-2.compute.amazonaws.com
ec2-34-221-167-247.ap-northeast-3.compute.amazonaws.com
ec2-34-221-167-247.ap-southeast-1.compute.amazonaws.com
ec2-34-221-167-247.ap-southeast-2.compute.amazonaws.com
ec2-34-221-167-247.ap-southeast-3.compute.amazonaws.com
ec2-34-221-167-247.ca-central-1.compute.amazonaws.com
ec2-34-221-167-247.eu-central-1.compute.amazonaws.com
ec2-34-221-167-247.eu-west-1.compute.amazonaws.com
ec2-34-221-167-247.eu-west-2.compute.amazonaws.com
ec2-34-219-81-114.eu-west-3.compute.amazonaws.com
ec2-52-35-119-24.eu-south-1.compute.amazonaws.com
ec2-35-160-82-97.eu-north-1.compute.amazonaws.com
ec2-34-223-253-69.me-south-1.compute.amazonaws.com
ec2-34-216-36-192.sa-east-1.compute.amazonaws.com
'
# 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