\n at end of embedded string causes regex to fail to match

Using the below regex's I'm attempting to extract a string value that is contained in double quotes and convert the matches values into a Map. This works as expected for the string "e,r,t,\"$0 = 1\n$1 = 2\n$5 = 6\",a,b,c,d"; but when I add a \n to at end of embedded string : "e,r,t,\"$0 = 1\n$1 = 2\n$5 = 6\n\",a,b,c,d"; the map is not populated.

src :

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ReadLine {

    public static void main(String args[]) throws IOException {

        final String st = "e,r,t,\"$0 = 1\n$1 = 2\n$5 = 6\n\",a,b,c,d";

        final Pattern quotesPattern = Pattern.compile("\"(.*?)\"", Pattern.DOTALL);
        final Matcher quotesMatcher = quotesPattern.matcher(st);
        quotesMatcher.find();
        String mv = quotesMatcher.group(0).replace("\n", ", ");
        System.out.println("mv : " + mv);

        final Map<String, String> mappedValues = new HashMap<String, String>();

        final Pattern find = Pattern.compile("(\" *\\$\\p{Alnum}+ *= *\\p{Alnum}+ *(?:, *\\$\\p{Alnum}+ *= *\\p{Alnum}+ *)*\")");
        final Pattern extract = Pattern.compile("\\$(\\p{Alnum}+) *= *(\\p{Alnum}+)");

        final Matcher matcher = find.matcher(mv);
        while (matcher.find()) {
            final Matcher extractor2 = extract.matcher(matcher.group(0));
            while (extractor2.find())
                System.out.println(extractor2.group(1) +"->"+extractor2.group(2));
        }
    }

}

which prints:

mv : "$0 = 1, $1 = 2, $5 = 6, "

The regex is not matched.

If I use instead :

final String st = "e,r,t,\"$0 = 1\n$1 = 2\n$5 = 6\",a,b,c,d";

prints :

mv : "$0 = 1, $1 = 2, $5 = 6"
0->1
1->2
5->6

So the omission of \n allows the regex to match.

I expect

0->1
1->2
5->6

to matched regardless of if \n occurs at end of embedded string or not.

I don't like the fact of using String mv = quotesMatcher.group(0).replace("\n", ", "); and there is likely a cleaner way of parsing these values but how to edit so that if \n occurs at end of embedded string the values are matched ?