/* package whatever; // don't place package name! */
 
import java.util.*;
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 sentence = "this is my sentence \"course of math\" of this year"; 
		System.out.println(sentence.replaceAll("(?s)[^\"]*\"(\\w+).*", "$1"));
		// Or - if there can be a space after the first quote:
		sentence = "this is my sentence \"   course of math\" of this year"; 
    	System.out.println(sentence.replaceAll("(?s)[^\"]*\"\\s*(\\w+).*", "$1"));
	}
}

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