1. results.txt

[ /workspace/h2o ] >: ruby benchmark/parser.rb 
/
  (.*?)(?:
    \{%    (.*?)
    %\}          |
    \{\{      (.*?)
    \}\}            |
    \{\*  (.*?)
    \*\}    | (.*?) 
  )(?:\r?\n)
/mx
      user     system      total        real
String#scan :  0.070000   0.000000   0.070000 (  0.077598)
String#scan - with \G :  0.060000   0.000000   0.060000 (  0.059510)
String#scan - optimized :  0.030000   0.000000   0.030000 (  0.034286)
String#scan - optimized with \G :  0.040000   0.010000   0.050000 (  0.049830)

h2o parsing bench.rb

require 'rubygems'
require 'benchmark'
require File.dirname(__FILE__)+'/../lib/h2o'
require 'stringio'
require 'pp'
require 'strscan'

ParseRegex = /
  (.*?)(?:
    #{Regexp.escape(H2o::BLOCK_START)}    (.*?)
    #{Regexp.escape(H2o::BLOCK_END)}          |
    #{Regexp.escape(H2o::VAR_START)}      (.*?)
    #{Regexp.escape(H2o::VAR_END)}            |
    #{Regexp.escape(H2o::COMMENT_START)}  (.*?)
    #{Regexp.escape(H2o::COMMENT_END)}    | (.*?) 
  )(?:\r?\n)
/xm

ParseRegex2 = /\G
  (.*?)(?:
    #{Regexp.escape(H2o::BLOCK_START)}    (.*?)
    #{Regexp.escape(H2o::BLOCK_END)}          |
    #{Regexp.escape(H2o::VAR_START)}      (.*?)
    #{Regexp.escape(H2o::VAR_END)}            |
    #{Regexp.escape(H2o::COMMENT_START)}  (.*?)
    #{Regexp.escape(H2o::COMMENT_END)}
  ) (?:\r?\n)
/xm

ParseRegex3 = / (?:\{\{ .*? \}\}|.*?|\{(?:% .*? %|\* .*? \*)\}) \r?\n /mx

ParseRegex4 = /\G (?:\{\{ .*? \}\}|.*?|\{(?:% .*? %|\* .*? \*)\}) \r?\n /mx


file = File.read(File.dirname(__FILE__)+'/../benchmark/source.html')

pp ParseRegex

Benchmark.bm do|b|


  b.report('String#scan :') do
    file.scan(ParseRegex)
  end
   
  b.report('String#scan - with \G :') do
    file.scan(ParseRegex2)
  end
  
  b.report('String#scan - optimized :') do
    file.scan(ParseRegex3)
  end
  
  b.report('String#scan - optimized with \G :') do
    file.scan(ParseRegex4)
  end
end