import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
class Ideone
{
  public static void main (String[] args) throws java.lang.Exception
  {
    String input = "<input type=\"button\" value=\"<s:message code=\"key.test.text\"  />\n<input type=\"button2\" value='<s:message code=\"key.test.text1'  />;";
    String regex = "value\\s*=\\s*[\"']<s:message\\s+code\\s*=\\s*[\"']([^\"']+)[\"']\\s*\\/>";
 
    List<String> allMatches = new ArrayList<String>();
    Matcher m = Pattern.compile(regex).matcher(input);
 
    while (m.find()) {
      allMatches.add(m.group(1));
    }
 
    System.out.println(allMatches);
  }
}

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