Regex benchmark

gistfile1.rb

require 'benchmark'

@string = "this is a long string that I want 123 to appear in"

Benchmark.bmbm(6) do |x|
  x.report("String#match") do
    1_000_000.times do
      @string.match(/123/)
    end
  end
  
  x.report("Regexp#match") do
    1_000_000.times do
      /123/.match(@string)
    end
  end
  
  x.report("String#=~") do
    1_000_000.times do
      @string =~ /123/
    end
  end
  
  x.report("Regexp#=~") do
    1_000_000.times do
      /123/ =~ @string
    end
  end
  
  x.report("String#[]") do
    1_000_000.times do
      @string[/123/]
    end
  end
end

# Rehearsal ------------------------------------------------
# String#match   1.570000   0.000000   1.570000 (  1.585916)
# Regexp#match   1.510000   0.000000   1.510000 (  1.517587)
# String#=~      0.450000   0.000000   0.450000 (  0.446564)
# Regexp#=~      0.440000   0.000000   0.440000 (  0.447622)
# String#[]      0.590000   0.000000   0.590000 (  0.588521)
# --------------------------------------- total: 4.560000sec
# 
#                    user     system      total        real
# String#match   1.570000   0.000000   1.570000 (  1.580562)
# Regexp#match   1.510000   0.000000   1.510000 (  1.512344)
# String#=~      0.440000   0.000000   0.440000 (  0.445906)
# Regexp#=~      0.450000   0.000000   0.450000 (  0.449013)
# String#[]      0.590000   0.000000   0.590000 (  0.588304)