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Question

I am looking to split such string by comma :

 field1:"value1", field2:"value2", field3:"value3,value4"

into a string[] that would look like:

0     field1:"value1"
1     field2:"value2"
2     field3:"value3,value4"

I am trying to do that with Regex.Split but can't seem to work out the regular expression.

Answer 1

It'll be much easier to do this with Matches than with Split , for example

string[] asYouWanted = Regex.Matches(input, @"[A-Za-z0-9]+:"".*?""")
    .Cast<Match>()
    .Select(m => m.Value)
    .ToArray();

although if there is any chance of your values (or fields!) containing escaped quotes (or anything similarly tricky), then you might be better off with a proper CSV parser.

---

If you do have escaped quotes in your values, I think the following regex the work - give it a test:

@"field3:""value3\\"",value4""", @"[A-Za-z0-9]+:"".*?(?<=(?<!\\)(\\\\)*)"""

The added (?<=(?<!\\\\)(\\\\\\\\)*) is supposed to make sure that the " it stops matching on is preceeded by only an even number of slashes, as an odd number of slashes means it is escaped.

Answer 2

Untested but this should be Ok:

string[] parts = string.Split(new string[] { ",\"" }, StringSplitOptions.None);

remember to add the " back on the end if you need it.

Answer 3

string[] arr = str.Split(new string[] {"\","}}, StringSplitOptions.None).Select(str => str + "\"").ToArray();

按\\,分割\\,如webnoob所提到的那样后缀为尾随"使用select，然后强制转换为数组。

Answer 4

try this

// (\w.+?):"(\w.+?)"        
//         
// Match the regular expression below and capture its match into backreference number 1 «(\w.+?)»        
//    Match a single character that is a “word character” (letters, digits, and underscores) «\w»        
//    Match any single character that is not a line break character «.+?»        
//       Between one and unlimited times, as few times as possible, expanding as needed (lazy) «+?»        
// Match the characters “:"” literally «:"»        
// Match the regular expression below and capture its match into backreference number 2 «(\w.+?)»        
//    Match a single character that is a “word character” (letters, digits, and underscores) «\w»        
//    Match any single character that is not a line break character «.+?»        
//       Between one and unlimited times, as few times as possible, expanding as needed (lazy) «+?»        
// Match the character “"” literally «"»        


try {        
    Regex regObj = new Regex(@"(\w.+?):""(\w.+?)""");        
    Match matchResults = regObj.Match(sourceString);        
    string[] arr = new string[match.Captures.Count];        
    int i = 0;        
    while (matchResults.Success) {        
        arr[i] = matchResults.Value;        
        matchResults = matchResults.NextMatch();        
        i++;        
    }         
} catch (ArgumentException ex) {        
    // Syntax error in the regular expression        
}

Answer 5

The easiest inbuilt way is here . I checed it . It is working fine. It splits "Hai,\\"Hello,World\\"" into {"Hai","Hello,World"}