Regexp & back引用

Question

伙计们，我需要帮助从字符串中提取

"AAA，BBB"，"CCC"，DDDD

以下群体：

• CCC

• DDDD

1. AAA

是否可以通过regex提取三个组，如果是，那么如何提取？

谢谢。

Answer 1

功能

public void RunTest()
{
    const string toTest = "\"AAA, BBB\", \"CCC\", \"DDDD\"";
    var exp = new Regex("\G(?:^|,)\s*\"([^\"])\"");
    var matches = exp.Matches(toTest);
    foreach (var match in matches.Cast())
    {
        Console.WriteLine(@"Matched expression: {0}", match);
        foreach (var group in match.Groups.Cast())
        {
            Console.WriteLine(@"Matched group: {0}", group);
        }
    }
}

会回来

Matched expression: "AAA, BBB"
Matched group: "AAA, BBB"
Matched group: AAA, BBB
Matched expression: , "CCC"
Matched group: , "CCC"
Matched group: CCC
Matched expression: , "DDDD"
Matched group: , "DDDD"
Matched group: DDDD

所以收集每一组你就能得到我想要的。注意，我在DDDD周围添加了双引号。我以为那是个错误。如果它不是一个错误，您可以尝试正则表达式：

var exp = new Regex("\G(?:^|,)(?:\s(?:\"([^\"])\")|([^\",]))");

​

解释：

\G The match must occur at the point where the previous match ended.
[^"] Any character except the double quote
\s Any whitespace
* zero or more occurrences of the preceding element
( and ) define a group
(?: defines a noncapturing group

希望有帮助:)

​

Answer 2

var delimiterPattern = @",(?=(?:[^\"]\"[^\"]\")(?![^\"]\"))"; var parts = string.Split(delimiterPattern);

用于字符串:玩具"r"，"AAAA"，“玩具"，"r”，“r，”，“玩具”，"r“，”“，测试

将返回: 1.“玩具"r”r“us”2。"AAAA“3.”玩具" r“us”4.“玩具，r”，“5.玩具”，"r"，“6.试验”