public function slug() {
			$maybe_valid_value = esc_url_raw( $this->value );

			// esc_url_raw does the work of validating chars, but returns the checked string with a
			// prepended URL protocol; so let's use strpos to match the values.
			if ( false !== strpos( $maybe_valid_value, $this->value ) ) {
				$this->result->valid = true;
				$this->value         = sanitize_title( $this->value );
			} else {
				$this->result->valid = false;
				$this->result->error = sprintf( esc_html__( '%s must be a valid slug (numbers, letters, dashes, and underscores).', 'tribe-common' ), $this->label );
			}
		}