--- ninka-orig/lib/Ninka/SentenceExtractor.pm
+++ ninka/lib/Ninka/SentenceExtractor.pm
@@ -114,7 +114,7 @@
 
     # check for trailing bullets of different types
     s/^o //;
-    s/^\s*[0-9]{1-2}+\s*[\-\)]//;
+    s/^\s*[0-9]{1,2}+\s*[\-\)]//;
     s/^[ \t]+//;
     s/[ \t]+$//;