* as the element's closing symbol. But wait, it's in the content attribute and is not the end of the
		 * element. This is a limitation of using regex. It can't determine "wait a minute this is inside of quotation".
		 * If this happens, what gets matched is not the entire element or all of the content.
		 *
		 * Why not search for the name=description and then content="(.*)"?
		 * The attribute order could be opposite. Plus, additional attributes may exist including being between
		 * the name and content attributes.
		 *
		 * Why not lookahead?
		 * Lookahead is not constrained to stay within the element. The first <meta it finds may not include
		 * the name or content, but rather could be from a different element downstream.
		 */
		$pattern = '#<meta\s' .

				/*
				 * Allows for additional attributes before the content attribute.
				 * Searches for anything other than > symbol.
				 */
				'[^>]*' .

				/*
				* Find the content attribute. When found, capture its value (.*).
				*
				* Allows for (a) single or double quotes and (b) whitespace in the value.
				*
				* Why capture the opening quotation mark, i.e. (["\']), and then backreference,
				* i.e \1, for the closing quotation mark?
				* To ensure the closing quotation mark matches the opening one. Why? Attribute values
				* can contain quotation marks, such as an apostrophe in the content.
				*/
				'content=(["\']??)(.*)\1' .

				/*
				* Allows for additional attributes after the content attribute.
				* Searches for anything other than > symbol.
				*/
				'[^>]*' .

				/*
				* \/?> searches for the closing > symbol, which can be in either /> or > format.
				* # ends the pattern.
				*/
				'\/?>#' .

				/*
				* These are the options:
				* - i : case insensitive
				* - s : allows newline characters for the . match (needed for multiline elements)
				* - U means non-greedy matching
				*/
				'isU';

		preg_match_all( $pattern, $html, $elements );

		return $elements;
	}

	/**
	 * Gets the metadata from a target meta element.
	 *
	 * @since 5.9.0
	 *
	 * @param array  $meta_elements {
	 *     A multi-dimensional indexed array on success, else empty array.
	 *
	 *     @type string[] $0 Meta elements with a content attribute.
	 *     @type string[] $1 Content attribute's opening quotation mark.
	 *     @type string[] $2 Content attribute's value for each meta element.
	 * }
	 * @param string $attr       Attribute that identifies the element with the target metadata.
	 * @param string $attr_value The attribute's value that identifies the element with the target metadata.
	 * @return string The metadata on success. Empty string if not found.
	 */
	private function get_metadata_from_meta_element( $meta_elements, $attr, $attr_value ) {
		// Bail out if there are no meta elements.
		if ( empty( $meta_elements[0] ) ) {
			return '';
		}

		$metadata = '';
		$pattern  = '#' .
				/*
				 * Target this attribute and value to find the metadata element.
				 *
				 * Allows for (a) no, single, double quotes and (b) whitespace in the value.
				 *
				 * Why capture the opening quotation mark, i.e. (["\']), and then backreference,
				 * i.e \1, for the closing quotation mark?
				 * To ensure the closing quotation mark matches the opening one. Why? Attribute values
				 * can contain quotation marks, such as an apostrophe in the content.
				 */
				$attr . '=([\"\']??)\s*' . $attr_value . '\s*\1' .

				/*
				 * These are the options:
				 * - i : case insensitive
				 * - s : allows newline characters for the . match (needed for multiline elements)
				 * - U means non-greedy matching
				 */
				'#isU';

		// Find the metadata element.
		foreach ( $meta_elements[0] as $index => $element ) {
			preg_match( $pattern, $element, $match );

			// This is not the metadata element. Skip it.
			if ( empty( $match ) ) {
				continue;
			}

			/*
			 * Found the metadata element.
			 * Get the metadata from its matching content array.
			 */
			if ( isset( $meta_elements[2][ $index ] ) && is_string( $meta_elements[2][ $index ] ) ) {
				$metadata = trim( $meta_elements[2][ $index ] );
			}

			break;
		}

		return $metadata;
	}
}
<br />
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