Ruby-1

• Ruby API 文档 http://www.ruby-doc.org/core-2.0.0/
• Programming Ruby http://ishare.iask.sina.com.cn/f/22783772.html
• 替换字符串某一部分的方法 

  puts "hello".sub(/l/, '*')
  puts "hello".gsub(/l/, '*')
  
  puts "hello".sub(/lll/, '*')
  puts "hello".gsub(/lll/, '*')    #return itself if no gsub
  puts "hello".sub!(/lll/, '*')
  puts "hello".gsub!(/lll/, '*')    #return nil if no gsub
  sleep 10

• 正则表达式 http://www.ruby-doc.org/core-2.0.0/Regexp.html
  • 　　Regexps are created using the /.../ and %r{...} literals, and by theRegexp::new constructor.
• 区间 http://www.ruby-doc.org/core-2.0.0/Range.html　　　
  • 　　Ranges may be constructed using the s..e and s...e literals, or with ::new.
• 打印字符串 　　　

  puts "hello"