benchmark-results.txt

Rehearsal ----------------------------------------------------
split/map/reject   0.060000   0.000000   0.060000 (  0.064907)
scan with regex    0.030000   0.000000   0.030000 (  0.024250)
------------------------------------------- total: 0.090000sec

                       user     system      total        real
split/map/reject   0.070000   0.000000   0.070000 (  0.068857)
scan with regex    0.020000   0.000000   0.020000 (  0.023608)

benchmark.rb

require "benchmark"

str = "\n    \t\tab 09:09    \t\t\n    \t\tan 10:57    \t"
n = 10000

Benchmark.bmbm do |x|
  x.report("split/map/reject") do
    n.times do
      str.split(/\t/).map(&:strip).reject(&:empty?)
    end
  end

  x.report("scan with regex") do
    n.times do
      str.scan(/\d{2}:\d{2}/)
    end
  end
end