import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Map<String, String> dictionary = new HashMap<String, String>();
		dictionary.put("ä", "ae");
		dictionary.put("ö", "oe");
		dictionary.put("ü", "ue");
		String s = "<h1 id=\"anwendungsfälle-und--funktionen\">Anwendungsfälle und -funktionen</h1> \n<h1 id=\"öl\">Öl</h1>";
		StringBuffer result = new StringBuffer();
		Matcher m = Pattern.compile("(\\G(?!^)|<h\\d+\\s+id=\")([^\"]*?)([üöä])").matcher(s);
		while (m.find()) {
		    m.appendReplacement(result, m.group(1) + m.group(2) + dictionary.get(m.group(3)));
		}
		m.appendTail(result);
		System.out.println(result.toString());
 
	}
}

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