regexp is slow?

include_or_match.rb

require 'benchmark/ips'

str = "aaabbbccc"
ar = ['aaa', 'ccc']

Benchmark.ips do |x|
  x.report('String#include?') do
    str.include?('aaa') or str.include?('ccc')
  end
  x.report('Array#include?') do
    ar.any? { |w| str.include? w }
  end
  x.report('match') do
    str.match(/aaa|ccc/)
  end
end

result.txt

Warming up --------------------------------------
     String#include?   223.498k i/100ms
      Array#include?   199.110k i/100ms
               match    71.600k i/100ms
Calculating -------------------------------------
     String#include?      5.195M (± 4.5%) i/s -     26.149M in   5.044216s
      Array#include?      4.171M (± 3.5%) i/s -     20.907M in   5.018528s
               match    902.854k (± 3.2%) i/s -      4.511M in   5.001141s