Set vs Regex

set_vs_regex.rb

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"
  gem "benchmark-ips"
end

require "set"

GC.start
GC.disable

S = Set["com.mysite.blabla.foo.bar", "com.mysite.hehe.foo.bar"]
P = /com.mysite.(blabla|hehe).foo.bar/

INPUT = [
  "fr.groyoh.fake",
  "com.matz.mri",
  "com.jruby.www.truffle",
  "com.com.com",
  "com.anothersite.blabla.foo",
  "com.mysite.blabla.foo.bar",
  "com.mysite.hehe.foo.bar"
]

def rand
  INPUT.sample
end

Benchmark.ips do |x|
  #x.warmup = 20
  x.report("REGEX") do
    P =~ rand
  end
  x.report("Set") do
    S.include? rand
  end
  x.compare!
end
__END__
Warming up --------------------------------------
               REGEX    90.125k i/100ms
                 Set   151.577k i/100ms
Calculating -------------------------------------
               REGEX      2.029M (± 9.5%) i/s -     10.094M in   5.026880s
                 Set      4.371M (± 8.5%) i/s -     21.676M in   5.003899s

Comparison:
                 Set:  4370507.8 i/s
               REGEX:  2028924.8 i/s - 2.15x slower