diff --git a/build/index.py b/build/index.py
index febbc86..6a86af3 100644
--- a/build/index.py
+++ b/build/index.py
@@ -18,7 +18,7 @@ if len(sys.argv) < 2:
 # posts are arguments from index 1 onwards
 posts = sys.argv[1:]
 
-dir_pattern = re.compile("(.+)/(blog\/.+\.html)")
+dir_pattern = re.compile("(.+)\/(\d{4}\/\d+\/\d+\/.+\.html)")
 path_pattern = re.compile("(.+)\/(\d{4})\/(\d{1,2})\/(\d{1,2})\/(.+).html")
 title_pattern = re.compile("<h1>(.+)</h1>")