split.rb

require "benchmark"
 
n = 1_000_000
s = "a string to split"
 
d1 = / /
d2 = " "
 
Benchmark.bmbm do |x| 
  x.report("Regexp") do
    n.times do
      s.split(d1)
    end
  end
  
  x.report("String") do
    n.times do
      s.split(d2)
    end
  end
end
 
# Rehearsal ------------------------------------------
# Regexp   7.720000   0.060000   7.780000 (  7.794611)
# String   4.280000   0.020000   4.300000 (  4.413137)
# -------------------------------- total: 12.080000sec

#              user     system      total        real
# Regexp   8.530000   0.160000   8.690000 (  8.805900)
# String   4.350000   0.070000   4.420000 (  4.482934)