diff --git a/swh/web/ui/query.py b/swh/web/ui/query.py
index ee5fc1d53..e2377bd76 100644
--- a/swh/web/ui/query.py
+++ b/swh/web/ui/query.py
@@ -1,40 +1,40 @@
 # Copyright (C) 2015  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 
 import re
 
 from swh.core import hashutil
 
 
 # Regexp to filter and check inputs
-sha256_regexp='[0-9a-f]{64}'
-sha1_regexp='[0-9a-f]{40}'
+sha256_regexp = '[0-9a-f]{64}'
+sha1_regexp = '[0-9a-f]{40}'
 
 
 def categorize_hash(hash):
     """Categorize the hash string according to what it is.
 
     Args:
         hash: hash string representation (sha1 or sha256)
 
     Returns:
         A dictionary of hash indexed by their nature (sha1, sha256)
         The dictionary will be empty if nothing matches
 
     Raises:
         None
 
     """
     try:
         h = hashutil.hex_to_hash(hash)
     except ValueError:  # ignore silently to check the other inputs
         return {}
 
     if re.search(sha256_regexp, hash):
         return {'sha256': h}
     if re.search(sha1_regexp, hash):
         return {'sha1': h}
     return {}