public function email(  ) {
			$candidate = trim( $this->value );

			$this->result->valid = filter_var( $candidate, FILTER_VALIDATE_EMAIL );

			if ( ! $this->result->valid ) {
				$this->result->error = sprintf( esc_html__( '%s must be an email address.', 'tribe-common' ), $this->label );
			} else {
				$this->value = filter_var( trim( $candidate, FILTER_SANITIZE_EMAIL ) );
			}
		}