ruby-on-rails - 如何用 \n 字符替换新行

Question

存储在数据库中的数据是这样的：

This is a line

This is another line

How about this line

当我将其输出到视图时，我想将其转换为：

This is a line\n\nThis is another line\n\nHow about this line

没有新行并且\n打印出实际字符。我怎样才能做到这一点？

Answer 1

> s = "hi\nthere"
> puts s
hi
there
> puts s.gsub(/\n/, "\\n")
hi\nthere

Answer 2

gsub如果您只想专门转换换行符，我会亲自使用。但是，如果您想普遍检查字符串的内容，请执行以下操作：

str = "This is a line\n\nThis is another line\n\nHow about this line"
puts str.inspect[1..-2]
#=> This is a line\n\nThis is another line\n\nHow about this line

该String#inspect方法转义字符串中的各种“控制”字符。它还用"我在上面剥离的字符串包裹了字符串。请注意，这可能会产生不希望的结果，例如字符串My name is "Phrogz"将作为My name is \"Phrogz\".

Answer 3

> s = "line 1\n\nline2"
 => "line 1\n\nline2"  

> puts s
line 1

line2

> puts s.gsub("\n", "\\n")
line 1\n\nline2

关键是转义单个反斜杠。