【发布时间】：2019-01-14 05:36:28
【问题描述】：
我有一个 输入 CSV，它的数据用双引号括起来，字段分隔符是逗号 (,) 如下所示是 3 列和 1 行：
"Id","Description","LastModifiedDate","Quantity"
"101","this is a test message - "","" how are you, where are you from","2018-01-13","15.0"
"102","this is line break msg , "2019-01-01","13.0"
where data goes to next line"
我只想将字段分隔符从逗号 (,) 更改为插入符号 (^) 所以在从 Input CSV 读取行时我写了 line.replace("\",\"", "\"^\"") ; 低于实际结果：
"Id"^"Description"^"LastModifiedDate"
"101"^"this is a test message - ""^"" how are you, where are you from"^"2018-01-13"^"15.0"
"102"^"this is line break msg ^ "2019-01-01"^"13.0"
where data goes to next line"
问题是使用上面的替换代码，它将所有逗号替换为我不想要的插入符号。 预期输出应如下：
"Id"^"Description"^"LastModifiedDate"
"101"^"this is a test message - "","" how are you, where are you from"^"2018-01-13"^"15.0"
"102"^"this is line break msg ^ "2019-01-01"^"13.0"
where data goes to next line"
据我所知，这可以使用 Java 正则表达式来处理，但不幸的是，我不太擅长使用正则表达式，因此非常感谢任何帮助。
更新
Regex1 : replaceAll("\",\"(?!\"\")", "\"^\"");
Example1,
"Id","Description","LastModifiedDate","Quantity" -- header
"101","hello-this,is test data"",""testing","2018-10-01","\" -- input row1
"101"^"hello-this,is test data""^""testing"^"2018-10-01"^"\" -- post Regex1
"101"^"hello-this,is test data"",""testing"^"2018-10-01"^"\" -- expected
In first row if data contains "","" it still gets replaced to ""^""
Example2,
"Id","Description","LastModifiedDate","Quantity" -- header
"102","""text in double quotes""","13.2" -- input row2
"102","""text in double quotes"""^"13.2" -- post with only Regex1
"102"^""text in double quotes""^"13.2" -- expected result
So I tried one more regex after regex1 for second row scenario
Regex 2: replaceAll(",\"\"\"(?!\"\")", "^\"\"");
regex2 along with regex1 partially worked but still, the row1 issue is not getting resolved.
所有这些场景都可以在1个replaceAll中处理吗？或者多个replaceAll也可以
【问题讨论】：
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那是你使用 CSV 解析器的时候。
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你的意思是打开 CSV 吗？你能分享一个如何做到这一点的例子吗？
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未引用的字段呢？字段内的换行符？有吗？
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@WiktorStribiżew 所有字段都将始终用双引号引起来。是的，几个字段中有换行符。