/* package whatever; // don't place package name! */
 
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
	{
		final Pattern pat = Pattern.compile("\\s*'[^'\\\\]*(?:\\\\.[^'\\\\]*)*'\\s*");
 
	    System.out.println(pat.matcher("'abc'").matches());  // Out: true
	    System.out.println(pat.matcher("'abc\\'def'").matches()); //Out: false, expected true
	    System.out.println(pat.matcher("'abc'def'").matches()); // out false
	}
}

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