re = /username\s([a-zA-Z0-9]*)(?>\sprivilege\s([0-9]{1,2}))?.*/m
str = 'username ytnflvby secret <hash>
username eec privilege 15 secret <hash>
username protuser privilege 3 password 7 <hash>
username wheel privilege 0 secret <hash>
'
# 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