CODEWITHSUNDEEP
c#stringsplit
user3822370
user3822370

Reputation: 647

Split string with delimiter while checking for delimiter

How can I split a string based on a custom delimiter while also ensuring that the string ends with a delimiter? I am trying to process incoming client data and trying to divide up the messages. But it is possible that the client sends the server a message that is comprised of 3 smaller messages, where the third message is not yet complete. ie it does not contain the delimiter, meaning more is to come.

Example

using System;

public class Test{
    private string eofString = "<EOF>";
    private string[] eofArray = { "<EOF>" };


    public void Main(){
        string foo = "bob<EOF>jill<EOF>jake";
        string[] splitMessages = foo.Split(eofArray, StringSplitOptions.RemoveEmptyEntries);
        for(int i = 0; i < splitMessages.Length; i++){
            Console.WriteLine(splitMessages[i]);
        }       
    }
}

Outputs

bob
jill
jake

My expected output is 

bob
jill

because the end of the string foo did not end with <EOF>.

Which is wrong. I want to put jake in this case back into a string builder.

Upvotes: 0

Views: 146

Answers (3)

Tedford
Tedford

Reputation: 2932

If you wanted a regex based solution the following will work as well.

string input = "bob<EOF>jill<EOF>jake";
Regex r = new Regex(@"(?<message>.+?)\<EOF\>", RegexOptions.Compiled);
IEnumerable<string> messages = r.Matches(input).Cast<Match>().Select(i => i.Groups["message"].Value);

Basically it is using a non-greedy match pattern .+? (1 or more of any character, matching as few characters as possible) within a named captured group (?<message> #pattern goes here) that must be terminated with the fixed string <EOF>. All of the matches are found in one "pass" and just need to be projected out of the match collection by the name of the capture group.

Upvotes: 0

maraaaaaaaa
maraaaaaaaa

Reputation: 8163

You can split with this pattern:

"<EOF>([^\<]*)"

Upvotes: 0

lilezek
lilezek

Reputation: 7344

You can use String.EndsWith to determine if string ends with the delimiter.

Upvotes: 1

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