用用户输入[RUBY]替换字符串中的单词

Question

我正试图找出如何用用户字符串替换字符串中的单词。

系统将提示用户键入要替换的单词，然后再次提示用户输入新单词。

例如，起始字符串为"Hello，World"用户将输入"世界"然后他们会输入"Ruby"最后，"你好，鲁比"就会打印出来。

到目前为止，我尝试过使用gsub，[]方法都不起作用。有什么想法吗？

到目前为止，我的功能是：

def subString(string)
sentence = string
print"=========================n"
print sentence
print "n"
print "Enter the word you want to replace: "
replaceWord = gets
print "Enter what you want the new word to be: "
newWord = gets
sentence[replaceWord] = [newWord]
print sentence
#newString = sentence.gsub(replaceWord, newWord)
#newString = sentence.gsub("World", "Ruby")
#print newString 
end

Answer 1

问题是，当用户输入时，gets也会抓取新行，所以你想去掉它。我在控制台中做了这个愚蠢的测试用例

sentence = "hello world"
replace_with = gets  # put in hello
replace_with.strip!
sentence.gsub!(replace_with, 'butt')
puts sentence  # prints 'butt world'

Answer 2

当您进入"世界"时，您实际上按下了6个键：Wo1123>和5nter的修饰符键不会被识别为单独的字符(。因此，gets方法返回"Worldn"，其中n开始换行。

要删除这些换行符，有chomp:

"Worldn".chomp
#=> "World"

应用于您的代码：(以及一些小的修复(

sentence = "Hello, World."
puts "========================="
puts sentence
print "Enter the word you want to replace: "
replace_word = gets.chomp
print "Enter what you want the new word to be: "
new_word = gets.chomp
sentence[replace_word] = new_word
puts sentence

运行代码给出：

=========================
Hello, World.
Enter the word you want to replace: World
Enter what you want the new word to be: Ruby
Hello, Ruby.