in the content.
	 *
	 * @since 1.6.7
	 *
	 * @param string $content Content.
	 *
	 * @return array
	 */
	private function get_all_smart_tags( $content ) {

		/**
		 * A smart tag should start and end with a curly brace.
		 * ([a-z0-9_]+) a smart tag name and also the first capturing group. Lowercase letters, digits, and an  underscore.
		 * (|[ =][^\n}]*) - second capturing group:
		 * | no characters at all or the following:
		 * [ =][^\n}]* space or equal sign and any number of any characters except new line and closing curly brace.
		 */
		preg_match_all( '~{([a-z0-9_]+)(|[ =][^\n}]*)}~', $content, $smart_tags );

		return array_combine( $smart_tags[0], $smart_tags[1] );
	}

	/**
	 * Process smart tags.
	 *
	 * @since 1.6.7
	 * @since 1.8.7 Added `$context` parameter.
	 *
	 * @param string $content   Content.
	 * @param array  $form_data Form data.
	 * @param array  $fields    List of fields.
	 * @param string $entry_id  Entry ID.
	 * @param string $context   Context.
	 *
	 * @return string
	 */
	public function process( $content, $form_data, $fields = [], $entry_id = '', $context = '' ) {

		$smart_tags = $this->get_all_smart_tags( $content );

		if ( empty( $smart_tags ) ) {
			return $content;
		}

		foreach ( $smart_tags as $smart_tag => $tag_name ) {
			$class_name       = $this->get_smart_tag_class_name( $tag_name );
			$smart_tag_object = new $class_name( $smart_tag, $context );
			$value            = $smart_tag_object->get_value( $form_data, $fields, $entry_id );
			$field_id         = $smart_tag_object->get_attributes()['field_id'] ?? 0;
			$field_id         = (int) explode( '|', $field_id )[0];

			if (
				$context === 'confirmation_redirect' &&
				$field_id > 0 &&
				in_array(
					$fields[ $field_id ]['type'],
					wpforms_get_multi_fields(),
					true
				)
			) {
				// Protect from the case where user already placed a pipe in the value.
				$value = str_replace(
					[ "\r\n", "\r", "\n", '|' ],
					[ rawurlencode( '|' ), '|', '|', '|' ],
					$value
				);
			}

			/**
			 * Modify the smart tag value.
			 *
			 * @since 1.6.7
			 * @since 1.6.7.1 Added the 5th argument.
			 * @since 1.9.0 Added the 6th argument.
			 *
			 * @param scalar|null $value            Smart Tag value.
			 * @param array       $form_data        Form data.
			 * @param string      $fields           List of fields.
			 * @param int         $entry_id         Entry ID.
			 * @param SmartTag    $smart_tag_object The smart tag object or the Generic object for those cases when class unregistered.
			 * @param string      $context          Context.
			 */
			$value = apply_filters( // phpcs:ignore WPForms.PHP.ValidateHooks.InvalidHookName
				"wpforms_smarttags_process_{$tag_name}_value",
				$value,
				$form_data,
				$fields,
				$entry_id,
				$smart_tag_object,
				$context
			);

			/**
			 * Modify a smart tag value.
			 *
			 * @since 1.6.7.1
			 *
			 * @param scalar|null $value            Smart Tag value.
			 * @param string      $tag_name         Smart tag name.
			 * @param array       $form_data        Form data.
			 * @param string      $fields           List of fields.
			 * @param int         $entry_id         Entry ID.
			 * @param SmartTag    $smart_tag_object The smart tag object or the Generic object for those cases when class unregistered.
			 */
			$value = apply_filters(
				'wpforms_smarttags_process_value',
				$value,
				$tag_name,
				$form_data,
				$fields,
				$entry_id,
				$smart_tag_object
			);

			if ( $value !== null ) {
				$content = $this->replace( $smart_tag, $value, $content );
			}

			/**
			 * Modify content with smart tags.
			 *
			 * @since      1.4.0
			 * @since      1.6.7.1 Added 3rd, 4th, 5th, 6th arguments.
			 *
			 * @param string   $content          Content of the Smart Tag.
			 * @param string   $tag_name         Tag name of the Smart Tag.
			 * @param array    $form_data        Form data.
			 * @param string   $fields           List of fields.
			 * @param int      $entry_id         Entry ID.
			 * @param SmartTag $smart_tag_object The smart tag object or the Generic object for those cases when class unregistered.
			 */
			$content = (string) apply_filters(
				'wpforms_smart_tag_process',
				$content,
				$tag_name,
				$form_data,
				$fields,
				$entry_id,
				$smart_tag_object
			);
		}

		return $content;
	}

	/**
	 * Determine if the smart tag is registered.
	 *
	 * @since 1.6.7
	 *
	 * @param string $smart_tag_name Smart tag name.
	 *
	 * @return bool
	 */
	protected function has_smart_tag( $smart_tag_name ) {

		return array_key_exists( $smart_tag_name, $this->get_smart_tags() );
	}

	/**
	 * Get smart tag class name.
	 *
	 * @since 1.6.7
	 *
	 * @param string $smart_tag_name Smart tag name.
	 *
	 * @return string
	 */
	protected function get_smart_tag_class_name( $smart_tag_name ) {

		if ( ! $this->has_smart_tag( $smart_tag_name ) ) {
			return Generic::class;
		}

		$class_name = str_replace( ' ', '', ucwords( str_replace( '_', ' ', $smart_tag_name ) ) );

		$full_class_name = '\\WPForms\\SmartTags\\SmartTag\\' . $class_name;

		if ( class_exists( $full_class_name ) ) {
			return $full_class_name;
		}

		/**
		 * Modify a smart tag class name that describes the smart tag logic.
		 *
		 * @since 1.6.7
		 *
		 * @param string $class_name     The value.
		 * @param string $smart_tag_name Smart tag name.
		 */
		$full_class_name = apply_filters( 'wpforms_smarttags_get_smart_tag_class_name', '', $smart_tag_name );

		return class_exists( $full_class_name ) ? $full_class_name : Generic::class;
	}

	/**
	 * Retrieve the builder's special tags.
	 *
	 * @since 1.6.7
	 *
	 * @return array
	 */
	protected function get_replacement_builder_tags() {

		return [
			'date'      => 'date format="m/d/Y"',
			'query_var' => 'query_var key=""',
			'user_meta' => 'user_meta key=""',
		];
	}

	/**
	 * Hide smart tags in the builder.
	 *
	 * @since 1.6.7
	 *
	 * @return array
	 */
	protected function get_hidden_builder_tags() {

		return [
			'field_id',
			'field_html_id',
			'field_value_id',
		];
	}

	/**
	 * Builder tags.
	 *
	 * @since 1.6.7
	 *
	 * @return array
	 */
	public function builder() {

		$smart_tags       = $this->get_smart_tags();
		$replacement_tags = $this->get_replacement_builder_tags();
		$hidden_tags      = $this->get_hidden_builder_tags();

		foreach ( $replacement_tags as $tag => $replacement_tag ) {
			$smart_tags = wpforms_array_insert( $smart_tags, [ $replacement_tag => $smart_tags[ $tag ] ], $tag );

			unset( $smart_tags[ $tag ] );
		}

		foreach ( $hidden_tags as $hidden_tag ) {
			unset( $smart_tags[ $hidden_tag ] );
		}

		return $smart_tags;
	}

	/**
	 * Replace a found smart tag with the final value.
	 *
	 * @since 1.6.7
	 *
	 * @param string $tag     The tag.
	 * @param string $value   The value.
	 * @param string $content Content.
	 *
	 * @return string
	 */
	private function replace( $tag, $value, $content ) {

		return str_replace( $tag, strip_shortcodes( $value ), $content );
	}

	/**
	 * Replace a found smart tag with the final value.
	 *
	 * @codeCoverageIgnore
	 *
	 * @since      1.5.9
	 * @deprecated 1.6.7
	 *
	 * @param string $tag     The tag.
	 * @param string $value   The value.
	 * @param string $content Content.
	 *
	 * @return string
	 */
	public function parse( $tag, $value, $content ) {

		_deprecated_function( __METHOD__, '1.6.7 of the WPForms plugin' );

		return $this->replace( $tag, $value, $content );
	}
}