X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FContent%2FText%2FBBCode.php;h=a8b5ec2025546e7ffa0e694597d2f38524ccd8b1;hb=5e2cbce9b6efce2baaed69b6aad1537a51bdae9d;hp=61e48027e0d9dfdc116d4bb6155d7a9ee32cdd03;hpb=fdac992b6b7151c8f6e5052f6f293459cdd2dea9;p=friendica.git

diff --git a/src/Content/Text/BBCode.php b/src/Content/Text/BBCode.php
index 61e48027e0..a8b5ec2025 100644
--- a/src/Content/Text/BBCode.php
+++ b/src/Content/Text/BBCode.php
@@ -11,11 +11,13 @@ use Exception;
 use Friendica\BaseObject;
 use Friendica\Content\OEmbed;
 use Friendica\Content\Smilies;
-use Friendica\Core\Addon;
 use Friendica\Core\Cache;
 use Friendica\Core\Config;
+use Friendica\Core\Hook;
 use Friendica\Core\L10n;
+use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
+use Friendica\Core\Renderer;
 use Friendica\Core\System;
 use Friendica\Model\Contact;
 use Friendica\Model\Event;
@@ -25,6 +27,8 @@ use Friendica\Util\Map;
 use Friendica\Util\Network;
 use Friendica\Util\ParseUrl;
 use Friendica\Util\Proxy as ProxyUtils;
+use Friendica\Util\Strings;
+use Friendica\Util\XML;
 
 class BBCode extends BaseObject
 {
@@ -33,13 +37,14 @@ class BBCode extends BaseObject
 	 *
 	 * @param string $body Message body
 	 * @return array
-	 * 'type' -> Message type ("link", "video", "photo")
-	 * 'text' -> Text before the shared message
-	 * 'after' -> Text after the shared message
-	 * 'image' -> Preview image of the message
-	 * 'url' -> Url to the attached message
-	 * 'title' -> Title of the attachment
-	 * 'description' -> Description of the attachment
+	 *                     'type' -> Message type ("link", "video", "photo")
+	 *                     'text' -> Text before the shared message
+	 *                     'after' -> Text after the shared message
+	 *                     'image' -> Preview image of the message
+	 *                     'url' -> Url to the attached message
+	 *                     'title' -> Title of the attachment
+	 *                     'description' -> Description of the attachment
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function getOldAttachmentData($body)
 	{
@@ -104,13 +109,14 @@ class BBCode extends BaseObject
 	 *
 	 * @param string $body Message body
 	 * @return array
-	 * 'type' -> Message type ("link", "video", "photo")
-	 * 'text' -> Text before the shared message
-	 * 'after' -> Text after the shared message
-	 * 'image' -> Preview image of the message
-	 * 'url' -> Url to the attached message
-	 * 'title' -> Title of the attachment
-	 * 'description' -> Description of the attachment
+	 *                     'type' -> Message type ("link", "video", "photo")
+	 *                     'text' -> Text before the shared message
+	 *                     'after' -> Text after the shared message
+	 *                     'image' -> Preview image of the message
+	 *                     'url' -> Url to the attached message
+	 *                     'title' -> Title of the attachment
+	 *                     'description' -> Description of the attachment
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function getAttachmentData($body)
 	{
@@ -126,12 +132,12 @@ class BBCode extends BaseObject
 
 		$type = "";
 		preg_match("/type='(.*?)'/ism", $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$type = strtolower($matches[1]);
 		}
 
 		preg_match('/type="(.*?)"/ism', $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$type = strtolower($matches[1]);
 		}
 
@@ -149,12 +155,12 @@ class BBCode extends BaseObject
 
 		$url = "";
 		preg_match("/url='(.*?)'/ism", $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$url = $matches[1];
 		}
 
 		preg_match('/url="(.*?)"/ism', $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$url = $matches[1];
 		}
 
@@ -164,12 +170,12 @@ class BBCode extends BaseObject
 
 		$title = "";
 		preg_match("/title='(.*?)'/ism", $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$title = $matches[1];
 		}
 
 		preg_match('/title="(.*?)"/ism', $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$title = $matches[1];
 		}
 
@@ -182,12 +188,12 @@ class BBCode extends BaseObject
 
 		$image = "";
 		preg_match("/image='(.*?)'/ism", $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$image = $matches[1];
 		}
 
 		preg_match('/image="(.*?)"/ism', $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$image = $matches[1];
 		}
 
@@ -197,12 +203,12 @@ class BBCode extends BaseObject
 
 		$preview = "";
 		preg_match("/preview='(.*?)'/ism", $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$preview = $matches[1];
 		}
 
 		preg_match('/preview="(.*?)"/ism', $attributes, $matches);
-		if (x($matches, 1)) {
+		if (!empty($matches[1])) {
 			$preview = $matches[1];
 		}
 
@@ -230,7 +236,7 @@ class BBCode extends BaseObject
 		*/
 
 		$has_title = !empty($item['title']);
-		$plink = (!empty($item['plink']) ? $item['plink'] : '');
+		$plink = defaults($item, 'plink', '');
 		$post = self::getAttachmentData($body);
 
 		// if nothing is found, it maybe having an image.
@@ -341,6 +347,7 @@ class BBCode extends BaseObject
 	/**
 	 * @brief Converts a BBCode text into plaintext
 	 *
+	 * @param      $text
 	 * @param bool $keep_urls Whether to keep URLs in the resulting plaintext
 	 *
 	 * @return string
@@ -379,7 +386,7 @@ class BBCode extends BaseObject
 		$c = preg_match_all('/\[img.*?\](.*?)\[\/img\]/ism', $s, $matches, PREG_SET_ORDER);
 		if ($c) {
 			foreach ($matches as $mtch) {
-				logger('scale_external_image: ' . $mtch[1]);
+				Logger::log('scale_external_image: ' . $mtch[1]);
 
 				$hostname = str_replace('www.', '', substr(System::baseUrl(), strpos(System::baseUrl(), '://') + 3));
 				if (stristr($mtch[1], $hostname)) {
@@ -414,7 +421,7 @@ class BBCode extends BaseObject
 							$Image->scaleDown(640);
 							$new_width = $Image->getWidth();
 							$new_height = $Image->getHeight();
-							logger('scale_external_images: ' . $orig_width . '->' . $new_width . 'w ' . $orig_height . '->' . $new_height . 'h' . ' match: ' . $mtch[0], LOGGER_DEBUG);
+							Logger::log('scale_external_images: ' . $orig_width . '->' . $new_width . 'w ' . $orig_height . '->' . $new_height . 'h' . ' match: ' . $mtch[0], Logger::DEBUG);
 							$s = str_replace(
 								$mtch[0],
 								'[img=' . $new_width . 'x' . $new_height. ']' . $scaled . '[/img]'
@@ -423,7 +430,7 @@ class BBCode extends BaseObject
 									: ''),
 								$s
 							);
-							logger('scale_external_images: new string: ' . $s, LOGGER_DEBUG);
+							Logger::log('scale_external_images: new string: ' . $s, Logger::DEBUG);
 						}
 					}
 				}
@@ -442,6 +449,7 @@ class BBCode extends BaseObject
 	 * @brief Truncates imported message body string length to max_import_size
 	 * @param string $body
 	 * @return string
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function limitBodySize($body)
 	{
@@ -451,7 +459,7 @@ class BBCode extends BaseObject
 		// than the maximum, then don't waste time looking for the images
 		if ($maxlen && (strlen($body) > $maxlen)) {
 
-			logger('the total body length exceeds the limit', LOGGER_DEBUG);
+			Logger::log('the total body length exceeds the limit', Logger::DEBUG);
 
 			$orig_body = $body;
 			$new_body = '';
@@ -471,7 +479,7 @@ class BBCode extends BaseObject
 
 					if (($textlen + $img_start) > $maxlen) {
 						if ($textlen < $maxlen) {
-							logger('the limit happens before an embedded image', LOGGER_DEBUG);
+							Logger::log('the limit happens before an embedded image', Logger::DEBUG);
 							$new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 							$textlen = $maxlen;
 						}
@@ -485,7 +493,7 @@ class BBCode extends BaseObject
 
 					if (($textlen + $img_end) > $maxlen) {
 						if ($textlen < $maxlen) {
-							logger('the limit happens before the end of a non-embedded image', LOGGER_DEBUG);
+							Logger::log('the limit happens before the end of a non-embedded image', Logger::DEBUG);
 							$new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 							$textlen = $maxlen;
 						}
@@ -508,11 +516,11 @@ class BBCode extends BaseObject
 
 			if (($textlen + strlen($orig_body)) > $maxlen) {
 				if ($textlen < $maxlen) {
-					logger('the limit happens after the end of the last image', LOGGER_DEBUG);
+					Logger::log('the limit happens after the end of the last image', Logger::DEBUG);
 					$new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
 				}
 			} else {
-				logger('the text size with embedded images extracted did not violate the limit', LOGGER_DEBUG);
+				Logger::log('the text size with embedded images extracted did not violate the limit', Logger::DEBUG);
 				$new_body = $new_body . $orig_body;
 			}
 
@@ -528,10 +536,11 @@ class BBCode extends BaseObject
 	 * Note: Can produce a [bookmark] tag in the returned string
 	 *
 	 * @brief Processes [attachment] tags
-	 * @param string $return
+	 * @param string   $return
 	 * @param bool|int $simplehtml
-	 * @param bool $tryoembed
+	 * @param bool     $tryoembed
 	 * @return string
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function convertAttachment($return, $simplehtml = false, $tryoembed = true)
 	{
@@ -622,7 +631,7 @@ class BBCode extends BaseObject
 			$data["title"] = $data["url"];
 		}
 
-		if (($data["text"] == "") && ($data["title"] != "") && ($data["url"] == "")) {
+		if (empty($data["text"]) && !empty($data["title"]) && empty($data["url"])) {
 			return $data["title"] . $data["after"];
 		}
 
@@ -773,10 +782,10 @@ class BBCode extends BaseObject
 	/**
 	 * Performs a preg_replace within the boundaries of all named BBCode tags in a text
 	 *
-	 * @param type $pattern Preg pattern string
-	 * @param type $replace Preg replace string
-	 * @param type $name    BBCode tag name
-	 * @param type $text    Text to search
+	 * @param string $pattern Preg pattern string
+	 * @param string $replace Preg replace string
+	 * @param string $name    BBCode tag name
+	 * @param string $text    Text to search
 	 * @return string
 	 */
 	public static function pregReplaceInTag($pattern, $replace, $name, $text)
@@ -906,7 +915,7 @@ class BBCode extends BaseObject
 					$attributes['avatar'] = ProxyUtils::proxifyUrl($attributes['avatar'], false, ProxyUtils::SIZE_THUMB);
 				}
 
-				return $callback($attributes, $author_contact, $match[3], trim($match[1]) != '');
+				return $match[1] . $callback($attributes, $author_contact, $match[3], trim($match[1]) != '');
 			},
 			$text
 		);
@@ -926,6 +935,7 @@ class BBCode extends BaseObject
 	 * @param boolean $is_quote_share Whether there is content before the [share] block
 	 * @param integer $simplehtml     Mysterious integer value depending on the target network/formatting style
 	 * @return string
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function convertShareCallback(array $attributes, array $author_contact, $content, $is_quote_share, $simplehtml)
 	{
@@ -941,7 +951,7 @@ class BBCode extends BaseObject
 			case 3: // Diaspora
 				$headline = '<p><b>' . html_entity_decode('&#x2672; ', ENT_QUOTES, 'UTF-8') . $mention . ':</b></p>' . "\n";
 
-				if (stripos(normalise_link($attributes['link']), 'http://twitter.com/') === 0) {
+				if (stripos(Strings::normaliseLink($attributes['link']), 'http://twitter.com/') === 0) {
 					$text = ($is_quote_share? '<hr />' : '') . '<p><a href="' . $attributes['link'] . '">' . $attributes['link'] . '</a></p>' . "\n";
 				} else {
 					$text = ($is_quote_share? '<hr />' : '') . $headline . '<blockquote>' . trim($content) . '</blockquote>' . "\n";
@@ -976,7 +986,7 @@ class BBCode extends BaseObject
 				break;
 			default:
 				// Transforms quoted tweets in rich attachments to avoid nested tweets
-				if (stripos(normalise_link($attributes['link']), 'http://twitter.com/') === 0 && OEmbed::isAllowedURL($attributes['link'])) {
+				if (stripos(Strings::normaliseLink($attributes['link']), 'http://twitter.com/') === 0 && OEmbed::isAllowedURL($attributes['link'])) {
 					try {
 						$text = ($is_quote_share? '<br />' : '') . OEmbed::getHTML($attributes['link']);
 					} catch (Exception $e) {
@@ -985,8 +995,8 @@ class BBCode extends BaseObject
 				} else {
 					$text = ($is_quote_share? "\n" : '');
 
-					$tpl = get_markup_template('shared_content.tpl');
-					$text .= replace_macros($tpl, [
+					$tpl = Renderer::getMarkupTemplate('shared_content.tpl');
+					$text .= Renderer::replaceMacros($tpl, [
 						'$profile' => $attributes['profile'],
 						'$avatar'  => $attributes['avatar'],
 						'$author'  => $attributes['author'],
@@ -1138,8 +1148,9 @@ class BBCode extends BaseObject
 	 * @param int    $simple_html
 	 * @param bool   $for_plaintext
 	 * @return string
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	public static function convert($text, $try_oembed = true, $simple_html = false, $for_plaintext = false)
+	public static function convert($text, $try_oembed = true, $simple_html = 0, $for_plaintext = false)
 	{
 		$a = self::getApp();
 
@@ -1167,7 +1178,7 @@ class BBCode extends BaseObject
 		// Extracting multi-line code blocks before the whitespace processing
 		$codeblocks = [];
 
-		$text = preg_replace_callback("#\[code(?:=([^\]]*))?\](.*?)\[\/code\]#is",
+		$text = preg_replace_callback("#\[code(?:=([^\]]*))?\](.*?)\[\/code\]#ism",
 			function ($matches) use (&$codeblocks) {
 				$return = $matches[0];
 				if (strpos($matches[2], "\n") !== false) {
@@ -1282,7 +1293,7 @@ class BBCode extends BaseObject
 				$text);
 		} elseif ($simple_html == 7) {
 			$text = preg_replace("/([@!])\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
-				'$1<span class="vcard"><a href="$2" class="url" title="$3"><span class="fn nickname mention">$3</span></a></span>',
+				'$1<span class="vcard"><a href="$2" class="url u-url mention" title="$3"><span class="fn nickname mention">$3</span></a></span>',
 				$text);
 		} elseif (!$simple_html) {
 			$text = preg_replace("/([@!])\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
@@ -1319,7 +1330,7 @@ class BBCode extends BaseObject
 
 		// Handle Diaspora posts
 		$text = preg_replace_callback(
-			"&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
+			"&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
 			function ($match) {
 				return "[url=" . System::baseUrl() . "/display/" . $match[1] . "]" . $match[2] . "[/url]";
 			}, $text
@@ -1337,15 +1348,27 @@ class BBCode extends BaseObject
 		$expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
 		$text = preg_replace($expression, System::baseUrl()."/display/$1", $text);
 
-		$text = preg_replace("/([#])\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
-					'$1<a href="' . System::baseUrl() . '/search?tag=$3" class="tag" title="$3">$3</a>', $text);
-
-		$text = preg_replace("/\[url\=([$URLSearchString]*)\]#(.*?)\[\/url\]/ism",
-					'#<a href="' . System::baseUrl() . '/search?tag=$2" class="tag" title="$2">$2</a>', $text);
+		/* Tag conversion
+		 * Supports:
+		 * - #[url=<anything>]<term>[/url]
+		 * - [url=<anything>]#<term>[/url]
+		 */
+		$text = preg_replace_callback("/(?:#\[url\=[$URLSearchString]*\]|\[url\=[$URLSearchString]*\]#)(.*?)\[\/url\]/ism", function($matches) {
+			return '#<a href="'
+				. System::baseUrl()	. '/search?tag=' . rawurlencode($matches[1])
+				. '" class="tag" title="' . XML::escape($matches[1]) . '">'
+				. XML::escape($matches[1])
+				. '</a>';
+		}, $text);
+
+		// We need no target="_blank" for local links
+		// convert links start with System::baseUrl() as local link without the target="_blank" attribute
+		$escapedBaseUrl = preg_quote(System::baseUrl(), '/');
+		$text = preg_replace("/\[url\](".$escapedBaseUrl."[$URLSearchString]*)\[\/url\]/ism", '<a href="$1">$1</a>', $text);
+		$text = preg_replace("/\[url\=(".$escapedBaseUrl."[$URLSearchString]*)\](.*?)\[\/url\]/ism", '<a href="$1">$2</a>', $text);		
 
 		$text = preg_replace("/\[url\]([$URLSearchString]*)\[\/url\]/ism", '<a href="$1" target="_blank">$1</a>', $text);
 		$text = preg_replace("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism", '<a href="$1" target="_blank">$2</a>', $text);
-		//$Text = preg_replace("/\[url\=([$URLSearchString]*)\]([$URLSearchString]*)\[\/url\]/ism", '<a href="$1" target="_blank">$2</a>', $Text);
 
 		// Red compatibility, though the link can't be authenticated on Friendica
 		$text = preg_replace("/\[zrl\=([$URLSearchString]*)\](.*?)\[\/zrl\]/ism", '<a href="$1" target="_blank">$2</a>', $text);
@@ -1361,7 +1384,7 @@ class BBCode extends BaseObject
 		$text = preg_replace("/\[mail\=([$MAILSearchString]*)\](.*?)\[\/mail\]/", '<a href="mailto:$1">$2</a>', $text);
 
 		// leave open the posibility of [map=something]
-		// this is replaced in prepare_body() which has knowledge of the item location
+		// this is replaced in Item::prepareBody() which has knowledge of the item location
 
 		if (strpos($text, '[/map]') !== false) {
 			$text = preg_replace_callback(
@@ -1472,7 +1495,7 @@ class BBCode extends BaseObject
 
 		$text = str_replace('[hr]', '<hr />', $text);
 
-		// This is actually executed in prepare_body()
+		// This is actually executed in Item::prepareBody()
 
 		$text = str_replace('[nosmile]', '', $text);
 
@@ -1652,7 +1675,7 @@ class BBCode extends BaseObject
 		// Summary (e.g. title) is required, earlier revisions only required description (in addition to
 		// start which is always required). Allow desc with a missing summary for compatibility.
 
-		if ((x($ev, 'desc') || x($ev, 'summary')) && x($ev, 'start')) {
+		if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
 			$sub = Event::getHTML($ev, $simple_html);
 
 			$text = preg_replace("/\[event\-summary\](.*?)\[\/event\-summary\]/ism", '', $text);
@@ -1666,7 +1689,7 @@ class BBCode extends BaseObject
 
 		// Replace non graphical smilies for external posts
 		if ($simple_html) {
-			$text = Smilies::replace($text, false, true);
+			$text = Smilies::replace($text);
 		}
 
 		// Unhide all [noparse] contained bbtags unspacefying them
@@ -1720,7 +1743,7 @@ class BBCode extends BaseObject
 
 		// Clean up the HTML by loading and saving the HTML with the DOM.
 		// Bad structured html can break a whole page.
-		// For performance reasons do it only with ativated item cache or at export.
+		// For performance reasons do it only with activated item cache or at export.
 		if (!$try_oembed || (get_itemcachepath() != "")) {
 			$doc = new DOMDocument();
 			$doc->preserveWhiteSpace = false;
@@ -1746,7 +1769,7 @@ class BBCode extends BaseObject
 		//$Text = str_replace('<br /><li>', '<li>', $Text);
 		//$Text = str_replace('<br /><ul', '<ul ', $Text);
 
-		Addon::callHooks('bbcode', $text);
+		Hook::callAll('bbcode', $text);
 
 		return trim($text);
 	}
@@ -1799,7 +1822,12 @@ class BBCode extends BaseObject
 	 * @brief Callback function to replace a Friendica style mention in a mention for Diaspora
 	 *
 	 * @param array $match Matching values for the callback
+	 *                     [1] = Mention type (! or @)
+	 *                     [2] = Name
+	 *                     [3] = Address
 	 * @return string Replaced mention
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+	 * @throws \ImagickException
 	 */
 	private static function bbCodeMention2DiasporaCallback($match)
 	{
@@ -1813,7 +1841,7 @@ class BBCode extends BaseObject
 			return $match[0];
 		}
 
-		$mention = '@{' . $match[2] . '; ' . $contact['addr'] . '}';
+		$mention = $match[1] . '{' . $match[2] . '; ' . $contact['addr'] . '}';
 		return $mention;
 	}
 
@@ -1826,6 +1854,7 @@ class BBCode extends BaseObject
 	 * @param string $text
 	 * @param bool   $for_diaspora Diaspora requires more changes than Libertree
 	 * @return string
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function toMarkdown($text, $for_diaspora = true)
 	{
@@ -1898,14 +1927,88 @@ class BBCode extends BaseObject
 		if ($for_diaspora) {
 			$url_search_string = "^\[\]";
 			$text = preg_replace_callback(
-				"/([@]\[(.*?)\])\(([$url_search_string]*?)\)/ism",
+				"/([@!])\[(.*?)\]\(([$url_search_string]*?)\)/ism",
 				['self', 'bbCodeMention2DiasporaCallback'],
 				$text
 			);
 		}
 
-		Addon::callHooks('bb2diaspora', $text);
+		Hook::callAll('bb2diaspora', $text);
 
 		return $text;
 	}
+
+	/**
+     * @brief Pull out all #hashtags and @person tags from $string.
+     *
+     * We also get @person@domain.com - which would make
+     * the regex quite complicated as tags can also
+     * end a sentence. So we'll run through our results
+     * and strip the period from any tags which end with one.
+     * Returns array of tags found, or empty array.
+     *
+     * @param string $string Post content
+     * 
+     * @return array List of tag and person names
+     */
+    public static function getTags($string)
+    {
+        $ret = [];
+
+        // Convert hashtag links to hashtags
+        $string = preg_replace('/#\[url\=([^\[\]]*)\](.*?)\[\/url\]/ism', '#$2', $string);
+
+        // ignore anything in a code block
+        $string = preg_replace('/\[code.*?\].*?\[\/code\]/sm', '', $string);
+
+        // Force line feeds at bbtags
+        $string = str_replace(['[', ']'], ["\n[", "]\n"], $string);
+
+        // ignore anything in a bbtag
+        $string = preg_replace('/\[(.*?)\]/sm', '', $string);
+
+        // Match full names against @tags including the space between first and last
+        // We will look these up afterward to see if they are full names or not recognisable.
+
+        if (preg_match_all('/(@[^ \x0D\x0A,:?]+ [^ \x0D\x0A@,:?]+)([ \x0D\x0A@,:?]|$)/', $string, $matches)) {
+            foreach ($matches[1] as $match) {
+                if (strstr($match, ']')) {
+                    // we might be inside a bbcode color tag - leave it alone
+                    continue;
+                }
+
+                if (substr($match, -1, 1) === '.') {
+                    $ret[] = substr($match, 0, -1);
+                } else {
+                    $ret[] = $match;
+                }
+            }
+        }
+
+        // Otherwise pull out single word tags. These can be @nickname, @first_last
+        // and #hash tags.
+
+        if (preg_match_all('/([!#@][^\^ \x0D\x0A,;:?]+)([ \x0D\x0A,;:?]|$)/', $string, $matches)) {
+            foreach ($matches[1] as $match) {
+                if (strstr($match, ']')) {
+                    // we might be inside a bbcode color tag - leave it alone
+                    continue;
+                }
+                if (substr($match, -1, 1) === '.') {
+                    $match = substr($match,0,-1);
+                }
+                // ignore strictly numeric tags like #1
+                if ((strpos($match, '#') === 0) && ctype_digit(substr($match, 1))) {
+                    continue;
+                }
+                // try not to catch url fragments
+                if (strpos($string, $match) && preg_match('/[a-zA-z0-9\/]/', substr($string, strpos($string, $match) - 1, 1))) {
+                    continue;
+                }
+                $ret[] = $match;
+            }
+        }
+
+        return $ret;
+    }
 }