Ignore case on highlight....

ContactMatch match = (ContactMatch) m;
if (match.getFullname().toLowerCase().contains(_currentSearchString.toLowerCase())) {
    match.setHtmlName(match.getFullname().replaceAll(_currentSearchString, "<b>" + _currentSearchString + "</b>"));
    addMatch(match);
}

String _currentSearchString = "Pat";
String ret = ""; 
String fullName = "Patrik";
        
if (fullName.toLowerCase().contains(_currentSearchString.toLowerCase())) {
    for (String e : fullName.split(" ") ) {
        ret += e.toLowerCase().contains(_currentSearchString.toLowerCase()) ? "<b>"+ e + "</b>" : e;  
    }            
}

if (match.getFullname().toLowerCase().contains(_currentSearchString.toLowerCase())) {
    int start = match.getFullname().toLowerCase().indexOf(_currentSearchString.toLowerCase());
    String replace = match.getFullname().substring(start, start+_currentSearchString.length());
    match.setHtmlName(
            match.getFullname().replaceAll(
                    replace, 
                    "<b>"+replace+"</b>"
            )
    );                    
    addMatch(match);
}