split number from a string in c#

Question

I have a string in c# like this :

{ name: "Phai dấu cuộc tình", mp3: "audio\\16\\Phai dau cuoc tinh.mp3"},{ name: "Caravan of life", mp3: "audio\\4\\Caravan of life.mp3"},{ name: "I'm Forbidden", mp3: "audio\\11\\I'm Forbidden.mp3"},{ name: "Cause i love you", mp3: "audio\\6\\Cause i love you.mp3"},{ name: "Chỉ là giấc mơ", mp3: "audio\\8\\Chi la giac mo.mp3"},{ name: "Lột xác", mp3: "audio\\12\\Lot xac.mp3"}

I want to get the number between "\\" to a new string. For example, the result will be : 16;4;11;6;8;12. Any help would be great.

Can you tell us what you have done already? Have you gone to regex tutorials. there are a ton online — Justin Pihony
– Justin Pihony, Commented Dec 12, 2013 at 16:11
As @LSaks says, you've got a set of json data. Questions like this one will get you started. Once you've parsed the json, you can then easily use a regular expression to capture what's between the decoded audio\16\Phai... etc. — brandonscript
– brandonscript, Commented Dec 12, 2013 at 16:13
i tried function split in c#, it worked but i think it's not the good solution for it. — Anh Nguyen
– Anh Nguyen, Commented Dec 12, 2013 at 16:14
@r3mus I dispute the claim that a regex engine that creates several result objects is slower that a JSON parser that creates a whole tree. Citation required, sir. — Gusdor
– Gusdor, Commented Dec 12, 2013 at 16:18

falsetru · Accepted Answer · 2013-12-12 16:21:03Z

6

Using positive lookaround assertions:

string str = "{ name: \"Phai dấu cuộc tình\", mp3: \"audio\\16\\Phai dau cuoc tinh.mp3\"},{ name: \"Caravan of life\", mp3: \"audio\\4\\Caravan of life.mp3\"},{ name: \"I'm Forbidden\", mp3: \"audio\\11\\I'm Forbidden.mp3\"},{ name: \"Cause i love you\", mp3: \"audio\\6\\Cause i love you.mp3\"},{ name: \"Chỉ là giấc mơ\", mp3: \"audio\\8\\Chi la giac mo.mp3\"},{ name: \"Lột xác\", mp3: \"audio\\12\\Lot xac.mp3\"}";

foreach (var match in Regex.Matches(str, @"(?<=\\)\d+(?=\\)"))
    Console.WriteLine(match);

Alternative: capturing group

foreach (Match match in Regex.Matches(str, @"\\(\d+)\\"))
    Console.WriteLine(match.Groups[1]);

ideone

edited Dec 12, 2013 at 16:21

answered Dec 12, 2013 at 16:13

falsetru

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