regex_bench.rb

regex_bench.rb

require 'benchmark/ips'

str = "this.is.a.top.level.domain/foo/bar"

by_char = lambda {|s|
  s.each_char.inject("") {|acc,c| 
    if c == "/"
      break acc
    end
    acc << c
  }
}

array = lambda {|s|
  s.split("").take_while {|c| c != "/" }.join("")
}

index = lambda {|s|
  s[0,s.index("/")]
}

r = %r{^[^\/]*}
regex = lambda {|s|
  r.match(s)[0]
}


puts index.call(str)
puts regex.call(str)
puts array.call(str)
puts by_char.call(str)

Benchmark.ips do |x|
  x.report("index") { index.call(str) }
  x.report("regex") { regex.call(str) }
  x.report("array") { array.call(str) }
  x.report("regex") { by_char.call(str) }
end

results.txt

this.is.a.top.level.domain
this.is.a.top.level.domain
this.is.a.top.level.domain
this.is.a.top.level.domain
Calculating -------------------------------------
               index     75109 i/100ms
               regex     38009 i/100ms
               array      4475 i/100ms
               regex      9586 i/100ms
-------------------------------------------------
               index  1387266.0 (±6.9%) i/s -    6910028 in   5.005856s
               regex   500365.5 (±6.3%) i/s -    2508594 in   5.033506s
               array    43816.5 (±7.2%) i/s -     219275 in   5.032708s
               regex    96205.1 (±5.4%) i/s -     488886 in   5.096688s