/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/* 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 = "GET public/hello.txt HTTP/1.1";
		Pattern pattern = Pattern.compile("(?<=GET )(.+)(?= HTTP\\/1.1)");
		Matcher matcher = pattern.matcher(line);
		while (matcher.find()) {
		    System.out.println("group 1: " + matcher.group(1));
		}
	}
}

LyogcGFja2FnZSB3aGF0ZXZlcjsgLy8gZG9uJ3QgcGxhY2UgcGFja2FnZSBuYW1lISAqLwoKaW1wb3J0IGphdmEudXRpbC4qOwppbXBvcnQgamF2YS5sYW5nLio7CmltcG9ydCBqYXZhLmlvLio7CmltcG9ydCBqYXZhLnV0aWwucmVnZXguTWF0Y2hlcjsKaW1wb3J0IGphdmEudXRpbC5yZWdleC5QYXR0ZXJuOwoKLyogTmFtZSBvZiB0aGUgY2xhc3MgaGFzIHRvIGJlICJNYWluIiBvbmx5IGlmIHRoZSBjbGFzcyBpcyBwdWJsaWMuICovCmNsYXNzIElkZW9uZQp7CglwdWJsaWMgc3RhdGljIHZvaWQgbWFpbiAoU3RyaW5nW10gYXJncykgdGhyb3dzIGphdmEubGFuZy5FeGNlcHRpb24KCXsKCQlTdHJpbmcgbGluZSA9ICJHRVQgcHVibGljL2hlbGxvLnR4dCBIVFRQLzEuMSI7CgkJUGF0dGVybiBwYXR0ZXJuID0gUGF0dGVybi5jb21waWxlKCIoPzw9R0VUICkoLispKD89IEhUVFBcXC8xLjEpIik7CgkJTWF0Y2hlciBtYXRjaGVyID0gcGF0dGVybi5tYXRjaGVyKGxpbmUpOwoJCXdoaWxlIChtYXRjaGVyLmZpbmQoKSkgewoJCSAgICBTeXN0ZW0ub3V0LnByaW50bG4oImdyb3VwIDE6ICIgKyBtYXRjaGVyLmdyb3VwKDEpKTsKCQl9Cgl9Cn0=