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require 'better-benchmark'
 
r1 = Regexp.new( 'a' )
r2 = /a/
s = 'a'
 
puts 'Regexp.new vs. /regexp/'
 
result = Benchmark.compare_realtime(
  :iterations => 10,
  :inner_iterations => 1_000_000,
  :verbose => true
) { |iteration|
  s =~ r1
}.with { |iteration|
  s =~ r2
}
 
Benchmark.report_on result
 
 
puts
puts 'Precreated /regexp/ vs. not precreated /regexp/'
 
result = Benchmark.compare_realtime(
  :iterations => 10,
  :inner_iterations => 1_000_000,
  :verbose => true
) { |iteration|
  s =~ r2
}.with { |iteration|
  s =~ /a/
}
 
Benchmark.report_on result
 
 
# % ruby19 --version
# ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]
 
# % ruby19 regexp-bench.rb
# Regexp.new vs. /regexp/
# ..........
# Set 1 mean: 1.141 s
# Set 1 std dev: 0.039
# Set 2 mean: 1.108 s
# Set 2 std dev: 0.011
# p.value: 0.000324752646734071
# W: 94.0
# The difference (-2.8%) IS statistically significant.
#
# Precreated /regexp/ vs. not precreated /regexp/
# ..........
# Set 1 mean: 1.081 s
# Set 1 std dev: 0.002
# Set 2 mean: 0.966 s
# Set 2 std dev: 0.011
# p.value: 1.0825088224469e-05
# W: 100.0
# The difference (-10.6%) IS statistically significant.