public ParseQuery<T> whereStartsWith(String key,String prefix){
  String regex="^" + Pattern.quote(prefix);
  whereMatches(key,regex);
  return this;
}

public ParseQuery < T > whereStartsWith ( String key , String prefix ) { String regex = "^" + Pattern . quote ( prefix ) ; whereMatches ( key , regex ) ; return this ; }
add a constraint for finding string values that start with a provided string . < p / > this query will use the backend index , so it will be fast even for large datasets .
