Now it first discards possible “non-word” characters at beginning and end of line, and splits by any number of them

lib/hashtag.php

@@ -1,7 +1,8 @@
 <?php
 
 function hashtag($str,$ucfirst=true) {
-	$str=preg_split('#\W#u',$str);
+	$str=preg_replace('#^\W*(.*)\W*$#','$1',$str);
+	$str=preg_split('#\W+#u',$str);
 	$c=count($str);
 	if ($c>1) {
 		($ucfirst) ? $beg=0 : $beg=1;