Question

如何从Ruby on Rails中的文本文件中删除特定行？

示例：

1: CLEAR                  ,  "Clear"
2: APPROACH_DIVERGING     ,  "Approach Diverging"
3: ADVANCE_APPROACH       ,  "Advance Approach"
4: APPROACH_RESTRICTED    ,  "Approach Restricted""
5: APPROACH2              ,  "Approach"

从上面的例子我想删除第3行。

3: ADVANCE_APPROACH       ,  "Advance Approach"

最后，它会显示如下：

CLEAR                  ,  "Clear"
APPROACH_DIVERGING     ,  "Approach Diverging"
APPROACH_RESTRICTED    ,  "Approach Restricted""
APPROACH2              ,  "Approach"

Answer 1

您可以将所有行读入数组，然后将它们写回文件，同时省略您不想要的行。（此代码仅搜索您提到的特定行，但您可以构建正则表达式以与line进行比较）。

lines = File.readlines(filename)
File.open(filename, "w") do |f|
  lines.each { |line| f.puts(line) unless line == "ADVANCE_APPROACH       ,  \"Advance Approach\"") }
end

如何从Ruby on Rails中的文本文件中删除特定行？

1 个答案: