Regexp & back references

Guys I need help to extract from string

"AAA, BBB", "CCC", DDDD

follow开发者_如何学Going groups:

1. AAA, BBB
2. CCC
3. DDDD

Is possible extract three groups by regex and if yes then how?

Thanks.

The function

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);
        }
    }
}

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

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

Explanations:

\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

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

for string: toys "r" us", "AAAA", "toys "r" us","toys ,r,","toys ,"r",",test

will return: 1. "toys "r" us" 2. "AAAA" 3. "toys "r" us" 4. "toys ,r," 5. "toys ,"r"," 6. test