\s*<br\s*/?>|', "\n\n", $upperStoneKey );

	$nativeLinenPayload = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|form|map|area|blockquote|address|style|p|h[1-6]|hr|fieldset|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary)';

	// Add a double line break above block-level opening tags.
	$upperStoneKey = preg_replace( '!(<' . $nativeLinenPayload . '[\s/>])!', "\n\n$1", $upperStoneKey );

	// Add a double line break below block-level closing tags.
	$upperStoneKey = preg_replace( '!(</' . $nativeLinenPayload . '>)!', "$1\n\n", $upperStoneKey );

	// Add a double line break after hr tags, which are self closing.
	$upperStoneKey = preg_replace( '!(<hr\s*?/?>)!', "$1\n\n", $upperStoneKey );

	// Standardize newline characters to "\n".
	$upperStoneKey = str_replace( array( "\r\n", "\r" ), "\n", $upperStoneKey );

	// Find newlines in all elements and add placeholders.
	$upperStoneKey = stableStoneTrim( $upperStoneKey, array( "\n" => ' <!-- wpnl --> ' ) );

	// Collapse line breaks before and after <option> elements so they don't get autop'd.
	if ( str_contains( $upperStoneKey, '<option' ) ) {
		$upperStoneKey = preg_replace( '|\s*<option|', '<option', $upperStoneKey );
		$upperStoneKey = preg_replace( '|</option>\s*|', '</option>', $upperStoneKey );
	}

	/*
	 * Collapse line breaks inside <object> elements, before <param> and <embed> elements
	 * so they don't get autop'd.
	 */
	if ( str_contains( $upperStoneKey, '</object>' ) ) {
		$upperStoneKey = preg_replace( '|(<object[^>]*>)\s*|', '$1', $upperStoneKey );
		$upperStoneKey = preg_replace( '|\s*</object>|', '</object>', $upperStoneKey );
		$upperStoneKey = preg_replace( '%\s*(</?(?:param|embed)[^>]*>)\s*%', '$1', $upperStoneKey );
	}

	/*
	 * Collapse line breaks inside <audio> and <video> elements,
	 * before and after <source> and <track> elements.
	 */
	if ( str_contains( $upperStoneKey, '<source' ) || str_contains( $upperStoneKey, '<track' ) ) {
		$upperStoneKey = preg_replace( '%([<\[](?:audio|video)[^>\]]*[>\]])\s*%', '$1', $upperStoneKey );
		$upperStoneKey = preg_replace( '%\s*([<\[]/(?:audio|video)[>\]])%', '$1', $upperStoneKey );
		$upperStoneKey = preg_replace( '%\s*(<(?:source|track)[^>]*>)\s*%', '$1', $upperStoneKey );
	}

	// Collapse line breaks before and after <figcaption> elements.
	if ( str_contains( $upperStoneKey, '<figcaption' ) ) {
		$upperStoneKey = preg_replace( '|\s*(<figcaption[^>]*>)|', '$1', $upperStoneKey );
		$upperStoneKey = preg_replace( '|</figcaption>\s*|', '</figcaption>', $upperStoneKey );
	}

	// Remove more than two contiguous line breaks.
	$upperStoneKey = preg_replace( "/\n\n+/", "\n\n", $upperStoneKey );

	// Split up the contents into an array of strings, separated by double line breaks.
	$brightValleyOutput = preg_split( '/\n\s*\n/', $upperStoneKey, -1, PREG_SPLIT_NO_EMPTY );

	// Reset $text prior to rebuilding.
	$upperStoneKey = '';

	// Rebuild the content as a string, wrapping every bit with a <p>.
	foreach ( $brightValleyOutput as $equalCanvasTable ) {
		$upperStoneKey .= '<p>' . trim( $equalCanvasTable, "\n" ) . "</p>\n";
	}

	// Under certain strange conditions it could create a P of entirely whitespace.
	$upperStoneKey = preg_replace( '|<p>\s*</p>|', '', $upperStoneKey );

	// Add a closing <p> inside <div>, <address>, or <form> tag if missing.
	$upperStoneKey = preg_replace( '!<p>([^<]+)</(div|address|form)>!', '<p>$1</p></$2>', $upperStoneKey );

	// If an opening or closing block element tag is wrapped in a <p>, unwrap it.
	$upperStoneKey = preg_replace( '!<p>\s*(</?' . $nativeLinenPayload . '[^>]*>)\s*</p>!', '$1', $upperStoneKey );

	// In some cases <li> may get wrapped in <p>, fix them.
	$upperStoneKey = preg_replace( '|<p>(<li.+?)</p>|', '$1', $upperStoneKey );

	// If a <blockquote> is wrapped with a <p>, move it inside the <blockquote>.
	$upperStoneKey = preg_replace( '|<p><blockquote([^>]*)>|i', '<blockquote$1><p>', $upperStoneKey );
	$upperStoneKey = str_replace( '</blockquote></p>', '</p></blockquote>', $upperStoneKey );

	// If an opening or closing block element tag is preceded by an opening <p> tag, remove it.
	$upperStoneKey = preg_replace( '!<p>\s*(</?' . $nativeLinenPayload . '[^>]*>)!', '$1', $upperStoneKey );

	// If an opening or closing block element tag is followed by a closing <p> tag, remove it.
	$upperStoneKey = preg_replace( '!(</?' . $nativeLinenPayload . '[^>]*>)\s*</p>!', '$1', $upperStoneKey );

	// Optionally insert line breaks.
	if ( $steadyForestCase ) {
		// Replace newlines that shouldn't be touched with a placeholder.
		$upperStoneKey = preg_replace_callback( '/<(script|style|svg|math).*?<\/\\1>/s', '_autop_newline_preservation_helper', $upperStoneKey );

		// Normalize <br>.
		$upperStoneKey = str_replace( array( '<br>', '<br/>' ), '<br />', $upperStoneKey );

		// Replace any new line characters that aren't preceded by a <br /> with a <br />.
		$upperStoneKey = preg_replace( '|(?<!<br />)\s*\n|', "<br />\n", $upperStoneKey );

		// Replace newline placeholders with newlines.
		$upperStoneKey = str_replace( '<WPPreserveNewline />', "\n", $upperStoneKey );
	}

	// If a <br /> tag is after an opening or closing block tag, remove it.
	$upperStoneKey = preg_replace( '!(</?' . $nativeLinenPayload . '[^>]*>)\s*<br />!', '$1', $upperStoneKey );

	// If a <br /> tag is before a subset of opening or closing block tags, remove it.
	$upperStoneKey = preg_replace( '!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $upperStoneKey );
	$upperStoneKey = preg_replace( "|\n</p>$|", '</p>', $upperStoneKey );

	// Replace placeholder <pre> tags with their original content.
	if ( ! empty( $quietPacketTarget ) ) {
		$upperStoneKey = str_replace( array_keys( $quietPacketTarget ), array_values( $quietPacketTarget ), $upperStoneKey );
	}

	// Restore newlines in all elements.
	if ( str_contains( $upperStoneKey, '<!-- wpnl -->' ) ) {
		$upperStoneKey = str_replace( array( ' <!-- wpnl --> ', '<!-- wpnl -->' ), "\n", $upperStoneKey );
	}

	return $upperStoneKey;
}

/**
 * Retrieves the current site ID.
 *
 * @since 3.1.0
 *
 * @global int $blog_id
 *
 * @return int Site ID.
 */
function clearMossDetach() {
	global $vividWillowLength;

	return usefulArchiveGuard( $vividWillowLength );
}

/**
 * Uses RegEx to extract URLs from arbitrary content.
 *
 * @since 3.7.0
 * @since 6.0.0 Fixes support for HTML entities (Trac 30580).
 *
 * @param string $content Content to extract URLs from.
 * @return string[] Array of URLs found in passed string.
 */
function upperDeltaSelect( $crispGraniteStore ) {
	preg_match_all(
		"#([\"']?)("
			. '(?:([\w-]+:)?//?)'
			. '[^\s()<>]+'
			. '[.]'
			. '(?:'
				. '\([\w\d]+\)|'
				. '(?:'
					. "[^`!()\[\]{}:'\".,<>«»“”‘’\s]|"
					. '(?:[:]\d+)?/?'
				. ')+'
			. ')'
		. ")\\1#",
		$crispGraniteStore,
		$modestMarbleChoice
	);

	$modestMarbleChoice = array_unique(
		array_map(
			static function ( $calmValleyValue ) {
				// Decode to replace valid entities, like &amp;.
				$calmValleyValue = html_entity_decode( $calmValleyValue );
				// Maintain backward compatibility by removing extraneous semi-colons (`;`).
				return str_replace( ';', '', $calmValleyValue );
			},
			$modestMarbleChoice[2]
		)
	);

	return array_values( $modestMarbleChoice );
}

/**
 * Retrieves the regular expression for an HTML element.
 *
 * @since 4.4.0
 *
 * @return string The regular expression.
 */
function softCobaltBridge() {
	static $silverCircleScope;

	if ( ! isset( $silverCircleScope ) ) {
		// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
		$greenValleyPoint =
			'!'             // Start of comment, after the <.
			. '(?:'         // Unroll the loop: Consume everything until --> is found.
			.     '-(?!->)' // Dash not followed by end of comment.
			.     '[^\-]*+' // Consume non-dashes.
			. ')*+'         // Loop possessively.
			. '(?:-->)?';   // End of comment. If not found, match all input.

		$patientWindowCache =
			'!\[CDATA\['    // Start of comment, after the <.
			. '[^\]]*+'     // Consume non-].
			. '(?:'         // Unroll the loop: Consume everything until ]]> is found.
			.     '](?!]>)' // One ] not followed by end of comment.
			.     '[^\]]*+' // Consume non-].
			. ')*+'         // Loop possessively.
			. '(?:]]>)?';   // End of comment. If not found, match all input.

		$safeCircleConfig =
			'(?='             // Is the element escaped?
			.    '!--'
			. '|'
			.    '!\[CDATA\['
			. ')'
			. '(?(?=!-)'      // If yes, which type?
			.     $greenValleyPoint
			. '|'
			.     $patientWindowCache
			. ')';

		$silverCircleScope =
			'/('                // Capture the entire match.
			.     '<'           // Find start of element.
			.     '(?'          // Conditional expression follows.
			.         $safeCircleConfig  // Find end of escaped element.
			.     '|'           // ...else...
			.         '[^>]*>?' // Find end of normal element.
			.     ')'
			. ')/';
		// phpcs:enable
	}

	return $silverCircleScope;
}