详细介绍Ruby中的正则表达式

/pattern/
/pattern/im  # 可以指定选项
%r!/usr/local! # 一般的分隔的正则表达式
实例
#!/usr/bin/ruby
 
line1 = "Cats are smarter than dogs";
line2 = "Dogs also like meat";
 
if ( line1 =~ /Cats(.*)/ )
 puts "Line1 contains Cats"
end
if ( line2 =~ /Cats(.*)/ )
 puts "Line2 contains Dogs"
end

Line1 contains Cats

# 下面匹配单个斜杠字符，不转义


%r|/|       
 
# Flag 字符可通过下面的语法进行匹配
%r[</(.*)>]i 

#!/usr/bin/ruby
 
phone = "2004-959-559 #This is Phone Number"
 
# 删除 Ruby 的注释
phone = phone.sub!(/#.*$/, "") 
puts "Phone Num : #{phone}"
 
# 移除数字以外的其他字符
phone = phone.gsub!(/\D/, "")  
puts "Phone Num : #{phone}"

Phone Num : 2004-959-559
Phone Num : 2004959559

#!/usr/bin/ruby
 
text = "rails are rails, really good Ruby on Rails"
 
# 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}"

Rails are Rails, really good Ruby on Rails