用CSV替换双引号（在限定符内）以进行SSIS导入

Question

我有一个SSIS包从.csv文件导入数据。此文件的每个条目都有doulbe引号（"）限定符，但也介于两者之间。我还添加了逗号（,）作为列分隔符。我无法向您提供我正在使用的原始数据，但这里是一个示例我的数据如何在平面文件源中传递：

"ID-1","A "B"", C, D, E","Today"
"ID-2","A, B, C, D, E,F","Yesterday"
"ID-3","A and nothing else","Today"

正如您所看到的，第二列可以包含引号（和逗号），这些引号会破坏我的SSIS导入，并指向此行。我对正则表达式并不熟悉，但我听说这可能对这种情况有所帮助。

在我看来，我需要用单引号（qazxsw poi）替换所有双引号（qazxsw poi），除了......

• ...所有引号都在一行的开头
• ...所有引号都在一行的末尾
• ...引用是"的一部分

你能有人帮我解决这个问题吗？会很好！

提前致谢！

Answer 1

要根据您的规范用单引号替换双引号，请使用此简单的正则表达式。此正则表达式将允许行的开头和/或结尾处的空格。

'

这是模式的解释：

","

Answer 2

您可以使用正则表达式匹配模式拆分列

string pattern = @"(?<!^\s*|,)""(?!,""|\s*$)";
string resultString = Regex.Replace(subjectString, pattern, "'", RegexOptions.Multiline);

See this

// (?<!^\s*|,)"(?!,"|\s*$)
// 
// Options: ^ and $ match at line breaks
// 
// Assert that it is impossible to match the regex below with the match ending at this position (negative lookbehind) «(?<!^\s*|,)»
//    Match either the regular expression below (attempting the next alternative only if this one fails) «^\s*»
//       Assert position at the beginning of a line (at beginning of the string or after a line break character) «^»
//       Match a single character that is a “whitespace character” (spaces, tabs, and line breaks) «\s*»
//          Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
//    Or match regular expression number 2 below (the entire group fails if this one fails to match) «,»
//       Match the character “,” literally «,»
// Match the character “"” literally «"»
// Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!,"|\s*$)»
//    Match either the regular expression below (attempting the next alternative only if this one fails) «,"»
//       Match the characters “,"” literally «,"»
//    Or match regular expression number 2 below (the entire group fails if this one fails to match) «\s*$»
//       Match a single character that is a “whitespace character” (spaces, tabs, and line breaks) «\s*»
//          Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
//       Assert position at the end of a line (at the end of the string or before a line break character) «$»

.

Answer 3

使用双引号和逗号加载CSV时，有一个限制是添加了额外的双引号，并且数据也附加了双引号，您可以在源文件的预览中查看。因此，添加派生列任务并给出以下表达式： -

（REPLACE（REPLACE（RIGHT（（（（（（（（（（（（（（（（（（（ “），”@“，”“）

粗体部分删除用双引号括起来的数据。

试试这个并告诉我这是否有用

Answer 4

在将值插入CSV目标之前，将文本限定符/(?:(?<=^")|(?<=",")).*?(?:(?="\s*$)|(?=","))/g 用于CSV目标，添加派生列表达式

demo

这将在您的文本字段中保留"