public static Function<String,String> tr(final String regexp,final String replacement){
  Objects.requireNonNull(regexp,"The regular expression must not be null");
  Objects.requireNonNull(replacement,"The replacement must not be null");
  return null;
}

public static Function < String , String > tr ( final String regexp , final String replacement ) { Objects . requireNonNull ( regexp , "The regular expression must not be null" ) ; Objects . requireNonNull ( replacement , "The replacement must not be null" ) ; return null ; }
replace patterns with expressions in a stream of strings .
