require "benchmark"

if(ARGV.size != 1)
  puts "Usage: ruby benchmark.rb <filename>"
  exit 1
end

def measure(data, pattern)
  count = 0
  elapsed = Benchmark.measure {
    count = data.scan(pattern).size
  }

  puts "#{elapsed.real * 1e3} - #{count}"
end

data = File.read(ARGV[0])

# Email
measure(data, /[\w\.+-]+@[\w\.-]+\.[\w\.-]+/)

# URI
measure(data, /[\w]+:\/\/[^\/\s?#]+[^\s?#]+(?:\?[^\s#]*)?(?:#[^\s]*)?/)

# IP
measure(data, /(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9])/)

require "benchmark"

if(ARGV.size != 1)
  puts "Usage: ruby benchmark.rb <filename>"
  exit 1
end

def measure(data, pattern)
  count = 0
  elapsed = Benchmark.measure {
    count = data.scan(Regexp.compile(pattern)).size
  }

  puts "#{elapsed.real * 1e3} - #{count}"
end

data = File.read(ARGV[0])

# Email
measure(data, '[\w\.+-]+@[\w\.-]+\.[\w\.-]+')

# URI
measure(data, '[\w]+:\/\/[^\/\s?#]+[^\s?#]+(?:\?[^\s#]*)?(?:#[^\s]*)?')

# IP
measure(data, '(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9])')

Include regex compilation in measuring
Ruby: Include regex compilation in measuring
