feed: compile regex once

lumbunglib/feed.py

@@ -12,7 +12,8 @@ import jinja2
 import requests
 from bs4 import BeautifulSoup
 from slugify import slugify
-from re import sub
+from re import compile as re_compile
+yamlre = re_compile('"')
 
 
 def write_etag(feed_name, feed_data):
@@ -119,12 +120,12 @@ def sanitize_yaml (frontmatter):
             #some fields are lists
             l = []
             for i in v:
-                i = sub('"', '\\"', i)
+                i = yamlre.sub('\\"', i)
                 l.append(i)
             frontmatter[k] = l
 
         else:
-            v = sub('"', '\\"', v)
+            v = yamlre.sub('\\"', v)
             frontmatter[k] = v
 
     return frontmatter