require 'strscan'
require 'benchmark'

line = "2007-09-18 12:28:49 INFO  logger (app/controllers/application.rb:88:in `log_processing') - [GET] AuthController.index"

COUNTER = 10000
Benchmark.bmbm(10) do |bench|
    bench.report "strscan" do
        COUNTER.times do
            scanner = StringScanner.new(line)
            timestamp = scanner.scan(/^\d{4}\-\d{2}\-\d{2} \d{2}:\d{2}:\d{2}/)
            scanner.skip(/\s+/)
            level = scanner.scan(/\w+/)
            scanner.skip(/\s+/)
            logger = scanner.scan(/\w+/)
            scanner.pos += 1
            scanner.skip_until(/\) - /)
            message = scanner.post_match
        end
    end

    bench.report "regexp" do
        COUNTER.times do
            r = Regexp.new('^(\d{4}\-\d{2}\-\d{2} \d{2}:\d{2}:\d{2})\s+(\w+)\s+(\w+)\s+\(.*?\) - (.*)')
            match_data = r.match(line)
            timestamp = match_data[1]
            level = match_data[2]
            logger = match_data[3]
            message = match_data[4]
        end
    end
end