/* 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
	{
 
String[] strings = new String[] {"abc.txt?param1=qwerty.controller&param2=xs?d.txt", "Hello, world!", "a?b"};
for (String str1 : strings) {
    Matcher matcher = Pattern.compile("^[^?]*").matcher(str1);
    String group1 = "";
    if (matcher.find()) {
         group1 = matcher.group();
    }
    System.out.println(group1);
}
 
}
}

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