simplecov

#!/usr/bin/env ruby

require 'benchmark/ips'

Benchmark.ips do |x|
  input = 's' * 1_000_000

  root = '/something/funny/is/here/'
  root_filter = /^#{Regexp.escape(root)}/io
  root_filter_a = /\A#{Regexp.escape(root)}/io

  x.report(:start_with?) { !input.downcase.start_with?(root) }
  x.report(:match_optimized) { !(input =~ root_filter) }
  x.report(:match_optimized_A) { !(input =~ root_filter_a) }
  x.report(:match_original) { !(input =~ /^#{Regexp.escape(root)}/i) }

  x.compare!
end