+=item ut_decimal COLUMN[, DIGITS]
+
+Check/untaint decimal numbers (up to DIGITS decimal places. If there is an
+error, returns the error, otherwise returns false.
+
+=item ut_decimaln COLUMN[, DIGITS]
+
+Check/untaint decimal numbers. May be null. If there is an error, returns
+the error, otherwise returns false.
+
+=cut
+
+sub ut_decimal {
+ my($self, $field, $digits) = @_;
+ $digits ||= '';
+ $self->getfield($field) =~ /^\s*(\d+(\.\d{0,$digits})?)\s*$/
+ or return "Illegal or empty (decimal) $field: ".$self->getfield($field);
+ $self->setfield($field, $1);
+ '';
+}
+
+sub ut_decimaln {
+ my($self, $field, $digits) = @_;
+ $self->getfield($field) =~ /^\s*(\d*(\.\d{0,$digits})?)\s*$/
+ or return "Illegal (decimal) $field: ".$self->getfield($field);
+ $self->setfield($field, $1);
+ '';
+}
+