diff --git a/classes/Notice.php b/classes/Notice.php
index 6b56a613db..a25991fa32 100644
--- a/classes/Notice.php
+++ b/classes/Notice.php
@@ -153,7 +153,7 @@ class Notice extends Memcached_DataObject
     function saveTags()
     {
         /* extract all #hastags */
-        $count = preg_match_all('/(?:^|\s)#([\pL\pN_\-\.]{1,64})/', strtolower($this->content), $match);
+        $count = preg_match_all('/(?:^|\s)#([\pL\pN_\-\.]{1,64})/u', strtolower($this->content), $match);
         if (!$count) {
             return true;
         }
diff --git a/lib/router.php b/lib/router.php
index a4547b3258..e956b02c63 100644
--- a/lib/router.php
+++ b/lib/router.php
@@ -116,6 +116,8 @@ class Router
     static $bare = array('requesttoken', 'accesstoken', 'userauthorization',
                          'postnotice', 'updateprofile', 'finishremotesubscribe');
 
+    const REGEX_TAG = '[^\/]+'; // [\pL\pN_\-\.]{1,64} better if we can do unicode regexes
+
     static function get()
     {
         if (!Router::$inst) {
@@ -348,14 +350,14 @@ class Router
             $m->connect('tag', array('action' => 'publictagcloud'));
             $m->connect('tag/:tag/rss',
                         array('action' => 'tagrss'),
-                        array('tag' => '[\pL\pN_\-\.]{1,64}'));
+                        array('tag' => self::REGEX_TAG));
             $m->connect('tag/:tag',
                         array('action' => 'tag'),
-                        array('tag' => '[\pL\pN_\-\.]{1,64}'));
+                        array('tag' => self::REGEX_TAG));
 
             $m->connect('peopletag/:tag',
                         array('action' => 'peopletag'),
-                        array('tag' => '[a-zA-Z0-9]+'));
+                        array('tag' => self::REGEX_TAG));
 
             // groups
 
@@ -812,7 +814,7 @@ class Router
                     $m->connect($a.'/:tag',
                                 array('action' => $a,
                                       'nickname' => $nickname),
-                                array('tag' => '[a-zA-Z0-9]+'));
+                                array('tag' => self::REGEX_TAG));
                 }
 
                 foreach (array('rss', 'groups') as $a) {
@@ -839,12 +841,12 @@ class Router
                 $m->connect('tag/:tag/rss',
                             array('action' => 'userrss',
                                   'nickname' => $nickname),
-                            array('tag' => '[\pL\pN_\-\.]{1,64}'));
+                            array('tag' => self::REGEX_TAG));
 
                 $m->connect('tag/:tag',
                             array('action' => 'showstream',
                                   'nickname' => $nickname),
-                            array('tag' => '[\pL\pN_\-\.]{1,64}'));
+                            array('tag' => self::REGEX_TAG));
 
                 $m->connect('rsd.xml',
                             array('action' => 'rsd',
@@ -875,7 +877,7 @@ class Router
                 foreach (array('subscriptions', 'subscribers') as $a) {
                     $m->connect(':nickname/'.$a.'/:tag',
                                 array('action' => $a),
-                                array('tag' => '[a-zA-Z0-9]+',
+                                array('tag' => self::REGEX_TAG,
                                       'nickname' => Nickname::DISPLAY_FMT));
                 }
 
@@ -903,12 +905,12 @@ class Router
                 $m->connect(':nickname/tag/:tag/rss',
                             array('action' => 'userrss'),
                             array('nickname' => Nickname::DISPLAY_FMT),
-                            array('tag' => '[\pL\pN_\-\.]{1,64}'));
+                            array('tag' => self::REGEX_TAG));
 
                 $m->connect(':nickname/tag/:tag',
                             array('action' => 'showstream'),
                             array('nickname' => Nickname::DISPLAY_FMT),
-                            array('tag' => '[\pL\pN_\-\.]{1,64}'));
+                            array('tag' => self::REGEX_TAG));
 
                 $m->connect(':nickname/rsd.xml',
                             array('action' => 'rsd'),
diff --git a/lib/util.php b/lib/util.php
index 1e73ff9ac9..f734062ece 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -787,7 +787,7 @@ function common_render_text($text)
 
     $r = preg_replace('/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}]/', '', $r);
     $r = common_replace_urls_callback($r, 'common_linkify');
-    $r = preg_replace('/(^|\&quot\;|\'|\(|\[|\{|\s+)#([\pL\pN_\-\.]{1,64})/e', "'\\1#'.common_tag_link('\\2')", $r);
+    $r = preg_replace('/(^|\&quot\;|\'|\(|\[|\{|\s+)#([\pL\pN_\-\.]{1,64})/ue', "'\\1#'.common_tag_link('\\2')", $r);
     // XXX: machine tags
     return $r;
 }