# !/usr/bin/ruby -w
# -*- encoding:utf-8 -*-
# filename: main.rb
# author: 简单教程(www.twle.cn)
# Copyright © 2015-2065 www.twle.cn. All rights reserved.

 
text = "rails 是 rails,  Ruby on Rails 非常好的 Ruby 框架"
 
# 把所有的 "rails" 改为 "Rails"
text.gsub!("rails", "Rails")
 
# 把所有的单词 "Rails" 都改成首字母大写
text.gsub!(/\brails\b/, "Rails")
 
puts "#{text}"