default void forEachMatchingFieldName(String regex,BiConsumer<String,String> function){
  forEachMatchingFieldName(Pattern.compile(regex),function);
}

default void forEachMatchingFieldName ( String regex , BiConsumer < String , String > function ) { forEachMatchingFieldName ( Pattern . compile ( regex ) , function ) ; }
apply the given function to all fields whose names match the given regular expression .
