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Benchmark about "recursive regex match?" vs "recursive my own match?"
require 'bundler/inline'
gemfile(true) do
ruby '~> 2.5'
source 'https://rubygems.org'
gem 'benchmark-ips'
end
require 'benchmark/ips'
BALANCED = '(a)(b)((c))'.freeze
UNBALANCED = '(a)(b)(c))'.freeze
COMPLEX_REGEX = /\A(?<paren>\([^()]*\g<paren>*\))*\z/x.freeze
SIMPLE_REGEX = /(\([^()]\))+/x.freeze
def my_match?(string)
string = string.dup
captured = string.gsub!(SIMPLE_REGEX, '')
# string.strip!
if captured.nil?
true
elsif captured == ''
false
else
my_match?(string)
end
end
Benchmark.ips do |x|
x.report('recursive regex using ruby match? method - positive case') do
BALANCED.match?(COMPLEX_REGEX)
end
x.report('recursive regex using ruby match? method - negative case') do
UNBALANCED.match?(COMPLEX_REGEX)
end
x.report('recursive method using my_match? method - positive case') do
my_match?(BALANCED)
end
x.report('recursive method using my_match? method - negative case') do
my_match?(UNBALANCED)
end
x.compare!
end
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Using benchmark-ips 2.7.2
Using bundler 1.17.2
Warming up --------------------------------------
recursive regex using ruby match? method - positive case
122.483k i/100ms
recursive regex using ruby match? method - negative case
128.298k i/100ms
recursive method using my_match? method - positive case
20.203k i/100ms
recursive method using my_match? method - negative case
20.465k i/100ms
Calculating -------------------------------------
recursive regex using ruby match? method - positive case
2.032M (± 2.1%) i/s - 10.166M in 5.004149s
recursive regex using ruby match? method - negative case
1.975M (± 3.1%) i/s - 9.879M in 5.006411s
recursive method using my_match? method - positive case
229.712k (± 5.3%) i/s - 1.152M in 5.026184s
recursive method using my_match? method - negative case
231.356k (± 5.1%) i/s - 1.167M in 5.054504s
Comparison:
recursive regex using ruby match? method - positive case: 2032494.3 i/s
recursive regex using ruby match? method - negative case: 1975252.4 i/s - same-ish: difference falls within error
recursive method using my_match? method - negative case: 231355.9 i/s - 8.79x slower
recursive method using my_match? method - positive case: 229711.9 i/s - 8.85x slower
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