Removes comments with C style (`//' and `/* */') in Ruby

comment_strip.rb

require 'strscan'

lex = [/"[^\\"]*(?:\\.[^\\"]*)*"/,     # string
       /'[^\\']*(?:\\.[^\\']*)*'/,     # char
       /\/\*.*?\*\//m,                 # multi-line
       /\/\/(?:.*?\\(?:\r?\n|\r))*.*/, # single-line
       /.|\s+/]                        # rest

ARGV.each do |source|
  stream = StringScanner.new File.read source
  until stream.eos? do
    code = stream.scan lex.find {|regex| stream.match? regex}
    print code unless code.start_with?('//') || code.start_with?('/*')
  end
end