Ruby 2.4 的一些新特性 已翻译 100%

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使用了 Regexp#match? 的更快的正则表达式
:
require 'benchmark/ips'

Benchmark.ips do |bench|
  EMPTY_STRING  = ''
  WHITESPACE    = "   \n\t\n   "
  CONTAINS_TEXT = '   hi       '

  PATTERN = /\A[[:space:]]*\z/

  bench.report('Regexp#match?') do
    PATTERN.match?(EMPTY_STRING)
    PATTERN.match?(WHITESPACE)
    PATTERN.match?(CONTAINS_TEXT)
  end

  bench.report('Regexp#match') do
    PATTERN.match(EMPTY_STRING)
    PATTERN.match(WHITESPACE)
    PATTERN.match(CONTAINS_TEXT)
  end

  bench.report('Regexp#=~') do
    PATTERN =~ EMPTY_STRING
    PATTERN =~ WHITESPACE
    PATTERN =~ CONTAINS_TEXT
  end

  bench.report('Regexp#===') do
    PATTERN === EMPTY_STRING
    PATTERN === WHITESPACE
    PATTERN === CONTAINS_TEXT
  end

  bench.compare!
end
# gxgssww3.n77888.com,ww2.n77888.com,www.baidu.com,ww4.n77888.comgxgss
# >> Warming up --------------------------------------
# >>        Regexp#match?   160.255k i/100ms
# >>         Regexp#match    44.904k i/100ms
# >>            Regexp#=~    71.184k i/100ms
# >>           Regexp#===    71.839k i/100ms
# >> Calculating -------------------------------------
# >>        Regexp#match?      2.630M (± 4.0%) i/s -     13.141M in   5.004929s
# >>         Regexp#match    539.361k (± 3.9%) i/s -      2.694M in   5.002868s
# >>            Regexp#=~    859.713k (± 4.2%) i/s -      4.342M in   5.060080s
# >>           Regexp#===    872.217k (± 3.5%) i/s -      4.382M in   5.030612s
# >>
# >> Comparison:
# >>        Regexp#match?:  2630002.5 i/s
# >>           Regexp#===:   872217.5 i/s - 3.02x slower
# >>            Regexp#=~:   859713.0 i/s - 3.06x slower
# >>         Regexp#match:   539361.3 i/s - 4.88x slower
gxgadphttp://a2.att.hudong.com/72/89/01300001248577140184892180475_s.jpggxgadp
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