java - 正则表达式转换将字符串转换为制表符分隔字段

Question

我想将字符串转换为制表符分隔格式。我认为选项 1 应该可以。但看起来选项 2 实际上产生了预期的结果。有人能解释一下为什么吗？

public class test {
    public static void main(String[] args) {
        String temp2 = "My name\" is something";
        System.out.println(temp2);
        System.out.println( "\"" + temp2.replaceAll("\"", "\\\"") +"\"");  //option 1
        System.out.println( "\"" + temp2.replaceAll("\"", "\\\\\"") +"\"");  //option 2
        if(temp2.contains("\"")) {
            System.out.println("Identified");
        }
    }
}

输出是:

My name" is something
"My name" is something"
"My name\" is something"
Identified

Answer 1

如果你想要Excel兼容的CSV格式，双引号的转义是两个个双引号，所以称为自转义。

String twoColumns = "\"a nice text\"\t\"with a \"\"quote\"\".";
String s = "Some \"quoted\" text.";
String s2 = "\"" + s.replace("\"", "\"\"") + "\"";

而且......计算反斜杠也不会让人头疼。