gistfile1.txt

mainframe:~/causes[master %]$ cat perf.rb 
#!/usr/bin/ruby
PASSENGER_LOG_REGEX = /(\w+)\s(\d+)\s(\d+).*Completed in (\d+\.\d+).*Rendering: (\d+\.\d+)/

File.open('jan-17-action-render-samples.log').each do |line|
  PASSENGER_LOG_REGEX =~ line
  puts {
    :month     => $1,
    :day       => $2,
    :hour      => $3,
    :overall   => $4,
    :rendering => $5
  }.inspect
end

mainframe:~/causes[master %]$ ./perf.rb 
./perf.rb:7: syntax error
    :month     => $1,
                 ^
./perf.rb:7: Can't set variable $1
./perf.rb:8: syntax error
    :day       => $2,
                 ^
./perf.rb:8: Can't set variable $2
./perf.rb:9: syntax error
    :hour      => $3,
                 ^
./perf.rb:9: Can't set variable $3
./perf.rb:10: syntax error
    :overall   => $4,
                 ^
./perf.rb:10: Can't set variable $4
./perf.rb:11: syntax error
    :rendering => $5
                 ^