public ParseQuery<T> whereContains(String key,String substring){
  String regex=Pattern.quote(substring);
  whereMatches(key,regex);
  return this;
}

public ParseQuery < T > whereContains ( String key , String substring ) { String regex = Pattern . quote ( substring ) ; whereMatches ( key , regex ) ; return this ; }
add a constraint for finding string values that contain a provided string . < p / > this will be slow for large datasets .
