使用Ruby来处理文本的教程_ruby专题_

 message = 'Heal the World…' puts message message1 = "Take home Rs #{100*3/2} " puts message1 Output : # ./string1.rb # Heal the World… # Take home Rs 150 

 irb>> str = >>EOF irb>> "hello world irb>> "how do you feel? irb>> "how r u ? irb>> EOF "hello, world\nhow do you feel?\nhow r u?\n" irb>> puts str hello, world how do you feel? how r u? 

 irb>> str = "The world for a horse" # String initialized with a value The world for a horse irb>> str*2 # Multiplying with an integer returns a # new string containing that many times # of the old string. The world for a horseThe world for a horse irb>> str + " Who said it ? " # Concatenation of strings using the '+' operator The world for a horse Who said it ? irb>> str<<" is it? " # Concatenation using the '<<' operator The world for a horse is it? 

 irb>> str[0] # The '[]' operator can be used to extract substrings, just # like accessing entries in an array. # The index starts from 0. 84 # A single index returns the ascii value # of the character at that position irb>> str[0,5] # a range can be specified as a pair. The first is the starting # index , second is the length of the substring from the # starting index. The w irb>> str[16,5]="Ferrari" # The same '[]' operator can be used # to replace substrings in a string # by using the assignment like '[]=' irb>>str The world for a Ferrari Irb>> str[10..22] # The range can also be specified using [x1..x2] for a Ferrari irb>> str[" Ferrari"]=" horse" # A substring can be specified to be replaced by a new # string. Ruby strings are intelligent enough to adjust the # size of the string to make up for the replacement string. irb>> s The world for a horse irb>> s.split # Split, splits the string based on the given delimiter # default is a whitespace, returning an array of strings. ["The", "world", "for", "a", "horse"] irb>> s.each(' ') { |str| p str.chomp(' ') } # each , is a way of block processing the # string splitting it on a record separator # Here, I use chomp() to cut off the trailing space "The" "world" "for" "a" "horse" 

 irb>> str = "hello, world" hello, world irb>> str.upcase HELLO, WORLD irb>>str # str, remains as is. Hello, world irb>> str.upcase! # here, str gets modified by the '!' at the end of # upcase. HELLO, WORLD irb>> str HELLO, WORLD 

 require 'csv' writer = CSV.open('mycsvfile.csv','w') begin print "Enter Contact Name: " name = STDIN.gets.chomp print "Enter Contact No: " num = STDIN.gets.chomp s = name+" "+num row1 = s.split writer << row1 print "Do you want to add more ? (y/n): " ans = STDIN.gets.chomp end while ans != "n" writer.close file = File.new('mycsvfile.csv') lines = file.readlines parsed = CSV.parse(lines.to_s) p parsed puts "" puts "Details of Contacts stored are as follows..." puts "" puts "-------------------------------" puts "Contact Name | Contact No" puts "-------------------------------" puts "" CSV.open('mycsvfile.csv','r') do |row| puts row[0] + " | " + row[1] puts "" end 

 Enter Contact Name: Santhosh Enter Contact No: 989898 Do you want to add more ? (y/n): y Enter Contact Name: Sandy Enter Contact No: 98988 Do you want to add more ? (y/n): n Details of Contacts stored are as follows... --------------------------------- Contact Name | Contact No --------------------------------- Santhosh | 989898 Sandy | 98988 

 require 'rexml/document' include REXML file = File.new('shoppingcart.xml') doc = Document.new(file) root = doc.root puts "" puts "Hello, #{root.attributes['id']}, Find below the bill generated for your purchase..." puts "" sumtotal = 0 puts "-----------------------------------------------------------------------" puts "Item\t\tQuantity\t\tPrice/unit\t\tTotal" puts "-----------------------------------------------------------------------" root.each_element('//item') { |item| code = item.attributes['code'] qty = item.elements["qty"].text.split(' ') price = item.elements["price"].text.split(' ') total = item.elements["price"].text.to_i * item.elements["qty"].text.to_i puts "#[code]\t\t #{qty}\t\t #{price}\t\t #{total}" puts "" sumtotal += total } puts "-----------------------------------------------------------------------" puts "\t\t\t\t\t\t Sum total : " + sumtotal.to_s puts "-----------------------------------------------------------------------" 

 Hello, santhosh, Find below the bill generated for your purchase... ------------------------------------------------------------------------- Item Quantity Price/unit Total ------------------------------------------------------------------------- CS001 2 100 200 CS002 5 200 1000 CS003 3 500 1500 CS004 5 150 750 ------------------------------------------------------------------------- Sum total : 3450 -------------------------------------------------------------------------- 

 doc = Document.new doc.add_element("cart1", {"id" => "user2"}) cart = doc.root.elements[1] item = Element.new("item") item.add_element("price") item.elements["price"].text = "100" item.add_element("qty") item.elements["qty"].text = "4" cart .elements << item 

 require 'rexml/document' require 'rexml/streamlistener' include REXML class
                
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