Question

我试图从用户那里获取输入，搜索文本文件（不区分大小写），然后显示匹配的文件（如果文件中的单词大小写）。我不知道如何从文件中获取单词，这是我的代码：

found = 0
words = [] 

puts "Please enter a word to add to text file"
input = gets.chomp

#Open text file in read mode 
File.open("filename", "r+") do |f|

  f.each do |line|
    if line.match(/\b#{input}\b/i)
      puts "#{input} was found in the file."   # <--- I want to show the matched word here
      #Set to 1 indicating word was found
      found = 1
    end
  end
end

Answer 1

所以，你要做的是存储match方法的结果，然后你就可以得到实际匹配的单词，即

。

if m = line.match( /\b#{input}\b/i )
  puts "#{m[0]} was found in the file."
  # ... etc.
end

更新

顺便说一下，你没有问过 - 但在这种情况下我会使用scan，这样我就可以在每一行上找到匹配单词的数组（因为在同一行上有多个匹配），像这样：

if m = line.scan( /\b#{input}\b/i )
  puts "Matches found on line #{f.lineno}: #{m.join(', ')}"
  # ... etc.
end

Answer 2

如果您不需要报告匹配的位置且文件不是太大，您可以这样做：

File.read("testfile").scan /\b#{input}\b/i

我们试一试：

text = <<THE_END
Now is the time for all good people
to come to the aid of their local
grocers, because grocers are important
to our well-being.  One more thing.
Grocers sell ice cream, and boy do I
love ice cream.
THE_END

input = "grocers"
F_NAME = "text"
File.write(F_NAME, text)

File.read(F_NAME).scan /\b#{input}\b/i
  # => ["grocers", "grocers", "Grocers"]

File.read(F_NAME)以单个字符串返回整个文本文件。 scan /\b#{input}\b/i被发送到该字符串。

在文本文件中搜索单词并显示（Ruby）

2 个答案:

更新