import java.util.*;
import java.util.regex.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String line = "One,Two,Three,Four";
		String regexp = "(?<delim>[^\\w\n\"']|^)(?<space> ?)(?:(?<quote>[\"']).*?\\k<quote>|[^\\s,]+)(?=\\k<delim>?)";
		Pattern pattern = Pattern.compile(regexp);
		Matcher matcher = pattern.matcher(line);
	    while (matcher.find()) {
	    	System.out.println("Match value: " + matcher.group());
	    	System.out.println("Delim: " + matcher.group("delim"));
		    System.out.println("Quote: " + matcher.group("quote"));
		  }
	}
}

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