Benchmark: regex interpolation

regex_interpolation.rb

require 'benchmark/ips'

GITHUB_COM = %r{https?://(?:www\.)?github\.com}i

Benchmark.ips do |x|
  x.report('with o') { %r{\A#{GITHUB_COM}/([^/]+)/?\z}o }
  x.report('without o') { %r{\A#{GITHUB_COM}/([^/]+)/?\z} }
  x.compare!
end

# Warming up --------------------------------------
#               with o   137.742k i/100ms
#            without o     7.493k i/100ms
# Calculating -------------------------------------
#               with o     10.680M (± 5.8%) i/s -     53.306M
#            without o     80.892k (± 2.6%) i/s -    404.622k
#
# Comparison:
#               with o: 10679946.9 i/s
#            without o:    80891.8 i/s - 132.03x slower