什么是非捕获组？如(?:"(?<1>[^]"]*)具体能匹配一些什么字符串?

[heavenkiller]

什么是非捕获组？如(?:"(?<1>[^]"]*)具体能匹配一些什么字符串?

[saucer]

(...) captures something, which can be backreferenced ethrough \number

(?<name>..) also captures something, which can be backreferenced through \k<name>

see
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpconbackreferenceconstructs.asp

but (?:...) is just a grouping construct and doesn't capture anything

(?:"(?<1>[^]"]*))

can match

"anything not " and ]

so if you have

1. abcdef"ghijk]

the expression will match

"ghijk

and with $1 having

ghijk

2. abcdef"ghijk"

the expression will match

"ghijk

and with $1 having

ghijk


string[] slist = {"abcdef\"ghijk]", "abcdef\"ghijk\"","abd"};

Regex re = new Regex(@"(?:""(?<1>[^]""]*))");

foreach (string s in slist)
{
Match m = re.Match(s);
Console.WriteLine("{0} matches? {1}\tthe matched part is {2} and $1 is {3}", s, m.Success, m.Value, m.Groups[1].Value);
}