diff --git a/spirit/category/admin/urls.py b/spirit/category/admin/urls.py
index 06b619c0..e7f04174 100644
--- a/spirit/category/admin/urls.py
+++ b/spirit/category/admin/urls.py
@@ -10,5 +10,5 @@ from . import views
 urlpatterns = [
     url(r'^$', views.index, name='index'),
     url(r'^create/$', views.create, name='create'),
-    url(r'^update/(?P<category_id>\d+)/$', views.update, name='update'),
+    url(r'^update/(?P<category_id>[0-9]+)/$', views.update, name='update'),
 ]
diff --git a/spirit/category/urls.py b/spirit/category/urls.py
index a35fa585..42260fb1 100644
--- a/spirit/category/urls.py
+++ b/spirit/category/urls.py
@@ -10,6 +10,6 @@ from . import views
 urlpatterns = [
     url(r'^$', views.IndexView.as_view(), name='index'),
 
-    url(r'^(?P<pk>\d+)/$', views.detail, kwargs={'slug': "", }, name='detail'),
-    url(r'^(?P<pk>\d+)/(?P<slug>[\w-]+)/$', views.detail, name='detail'),
-]
\ No newline at end of file
+    url(r'^(?P<pk>[0-9]+)/$', views.detail, kwargs={'slug': "", }, name='detail'),
+    url(r'^(?P<pk>[0-9]+)/(?P<slug>[\w-]+)/$', views.detail, name='detail'),
+]
diff --git a/spirit/comment/bookmark/urls.py b/spirit/comment/bookmark/urls.py
index 50ab4472..2242a0c0 100644
--- a/spirit/comment/bookmark/urls.py
+++ b/spirit/comment/bookmark/urls.py
@@ -8,6 +8,6 @@ from . import views
 
 
 urlpatterns = [
-    url(r'^(?P<topic_id>\d+)/create/$', views.create, name='create'),
-    url(r'^(?P<topic_id>\d+)/find/$', views.find, name='find'),
+    url(r'^(?P<topic_id>[0-9]+)/create/$', views.create, name='create'),
+    url(r'^(?P<topic_id>[0-9]+)/find/$', views.find, name='find'),
 ]
diff --git a/spirit/comment/flag/admin/urls.py b/spirit/comment/flag/admin/urls.py
index b03ba997..2524f594 100644
--- a/spirit/comment/flag/admin/urls.py
+++ b/spirit/comment/flag/admin/urls.py
@@ -11,5 +11,5 @@ urlpatterns = [
     url(r'^$', views.opened, name='index'),
     url(r'^opened/$', views.opened, name='opened'),
     url(r'^closed/$', views.closed, name='closed'),
-    url(r'^(?P<pk>\d+)/$', views.detail, name='detail'),
+    url(r'^(?P<pk>[0-9]+)/$', views.detail, name='detail'),
 ]
diff --git a/spirit/comment/flag/urls.py b/spirit/comment/flag/urls.py
index d64dc6dd..1f066e49 100644
--- a/spirit/comment/flag/urls.py
+++ b/spirit/comment/flag/urls.py
@@ -8,5 +8,5 @@ from . import views
 
 
 urlpatterns = [
-    url(r'^(?P<comment_id>\d+)/create/$', views.create, name='create'),
+    url(r'^(?P<comment_id>[0-9]+)/create/$', views.create, name='create'),
 ]
diff --git a/spirit/comment/forms.py b/spirit/comment/forms.py
index efe60cac..f05f5775 100644
--- a/spirit/comment/forms.py
+++ b/spirit/comment/forms.py
@@ -27,10 +27,10 @@ except ImportError as err:
     # There used to be a logger.exception here but
     # the traceback made things confusing when an unhandled was raised
     if settings.ST_UPLOAD_FILE_ENABLED:
-        logger.warning(
-            'Can\'t load python-magic. '
-            'Is libmagic installed?')
-        logger.error(err)
+        logger.info(
+            'File upload requires running: '
+            '`pip install django-spirit[files]`')
+        raise err
     magic = None
 
 
diff --git a/spirit/comment/history/urls.py b/spirit/comment/history/urls.py
index 66c4c4a9..156af886 100644
--- a/spirit/comment/history/urls.py
+++ b/spirit/comment/history/urls.py
@@ -8,5 +8,5 @@ from . import views
 
 
 urlpatterns = [
-    url(r'^(?P<comment_id>\d+)/$', views.detail, name='detail'),
+    url(r'^(?P<comment_id>[0-9]+)/$', views.detail, name='detail'),
 ]
diff --git a/spirit/comment/like/urls.py b/spirit/comment/like/urls.py
index b801140a..0097683d 100644
--- a/spirit/comment/like/urls.py
+++ b/spirit/comment/like/urls.py
@@ -8,6 +8,6 @@ from . import views
 
 
 urlpatterns = [
-    url(r'^(?P<comment_id>\d+)/create/$', views.create, name='create'),
-    url(r'^(?P<pk>\d+)/delete/$', views.delete, name='delete'),
+    url(r'^(?P<comment_id>[0-9]+)/create/$', views.create, name='create'),
+    url(r'^(?P<pk>[0-9]+)/delete/$', views.delete, name='delete'),
 ]
diff --git a/spirit/comment/poll/urls.py b/spirit/comment/poll/urls.py
index 9d168887..e7f5d559 100644
--- a/spirit/comment/poll/urls.py
+++ b/spirit/comment/poll/urls.py
@@ -8,8 +8,8 @@ from . import views
 
 
 urlpatterns = [
-    url(r'^close/(?P<pk>\d+)/$', views.close_or_open, name='close'),
-    url(r'^open/(?P<pk>\d+)/$', views.close_or_open, kwargs={'close': False}, name='open'),
-    url(r'^vote/(?P<pk>\d+)/$', views.vote, name='vote'),
-    url(r'^voters/(?P<pk>\d+)/$', views.voters, name='voters'),
+    url(r'^close/(?P<pk>[0-9]+)/$', views.close_or_open, name='close'),
+    url(r'^open/(?P<pk>[0-9]+)/$', views.close_or_open, kwargs={'close': False}, name='open'),
+    url(r'^vote/(?P<pk>[0-9]+)/$', views.vote, name='vote'),
+    url(r'^voters/(?P<pk>[0-9]+)/$', views.voters, name='voters'),
 ]
diff --git a/spirit/comment/urls.py b/spirit/comment/urls.py
index b8ab1bb6..62b0d923 100644
--- a/spirit/comment/urls.py
+++ b/spirit/comment/urls.py
@@ -14,15 +14,15 @@ from . import views
 
 
 urlpatterns = [
-    url(r'^(?P<topic_id>\d+)/publish/$', views.publish, name='publish'),
-    url(r'^(?P<topic_id>\d+)/publish/(?P<pk>\d+)/quote/$', views.publish, name='publish'),
+    url(r'^(?P<topic_id>[0-9]+)/publish/$', views.publish, name='publish'),
+    url(r'^(?P<topic_id>[0-9]+)/publish/(?P<pk>[0-9]+)/quote/$', views.publish, name='publish'),
 
-    url(r'^(?P<pk>\d+)/update/$', views.update, name='update'),
-    url(r'^(?P<pk>\d+)/find/$', views.find, name='find'),
-    url(r'^(?P<topic_id>\d+)/move/$', views.move, name='move'),
+    url(r'^(?P<pk>[0-9]+)/update/$', views.update, name='update'),
+    url(r'^(?P<pk>[0-9]+)/find/$', views.find, name='find'),
+    url(r'^(?P<topic_id>[0-9]+)/move/$', views.move, name='move'),
 
-    url(r'^(?P<pk>\d+)/delete/$', views.delete, name='delete'),
-    url(r'^(?P<pk>\d+)/undelete/$', views.delete, kwargs={'remove': False, }, name='undelete'),
+    url(r'^(?P<pk>[0-9]+)/delete/$', views.delete, name='delete'),
+    url(r'^(?P<pk>[0-9]+)/undelete/$', views.delete, kwargs={'remove': False, }, name='undelete'),
 
     url(r'^bookmark/', include(spirit.comment.bookmark.urls, namespace='bookmark')),
     url(r'^flag/', include(spirit.comment.flag.urls, namespace='flag')),
diff --git a/spirit/core/utils/markdown/block.py b/spirit/core/utils/markdown/block.py
index c3f8681f..77ef211a 100644
--- a/spirit/core/utils/markdown/block.py
+++ b/spirit/core/utils/markdown/block.py
@@ -59,9 +59,9 @@ class BlockGrammar(mistune.BlockGrammar):
                 r'vimeo\.com/'
                 r'(?:channels/'
                 r'|groups/[^/]+/videos/'
-                r'|album/(?:\d+)/video/'
+                r'|album/(?:[0-9]+)/video/'
                 r'|video/)?'
-                r'(?P<vimeo_id>\d+)'
+                r'(?P<vimeo_id>[0-9]+)'
                 r'(?:\?[^\s]+)?'
                 r'(?:\n+|$)'
             r')|'
@@ -105,14 +105,14 @@ class BlockGrammar(mistune.BlockGrammar):
     poll = re.compile(
         r'^(?:\[poll'
         r'((?:\s+name=(?P<name>[\w\-_]+))'
-        r'(?:\s+min=(?P<min>\d+))?'
-        r'(?:\s+max=(?P<max>\d+))?'
-        r'(?:\s+close=(?P<close>\d+)d)?'
+        r'(?:\s+min=(?P<min>[0-9]+))?'
+        r'(?:\s+max=(?P<max>[0-9]+))?'
+        r'(?:\s+close=(?P<close>[0-9]+)d)?'
         r'(?:\s+mode=(?P<mode>(default|secret)))?'
         r'|(?P<invalid_params>[^\]]*))'
         r'\])\n'
         r'((?:#\s*(?P<title>[^\n]+\n))?'
-        r'(?P<choices>(?:\d+\.\s*[^\n]+\n){2,})'
+        r'(?P<choices>(?:[0-9]+\.\s*[^\n]+\n){2,})'
         r'|(?P<invalid_body>(?:[^\n]+\n)*))'
         r'(?:\[/poll\])'
     )
diff --git a/spirit/core/utils/markdown/utils/quote.py b/spirit/core/utils/markdown/utils/quote.py
index e438b1cb..b7de3c19 100644
--- a/spirit/core/utils/markdown/utils/quote.py
+++ b/spirit/core/utils/markdown/utils/quote.py
@@ -11,7 +11,7 @@ from ....conf import settings
 
 _PATTERN_POLL = re.compile(
     r'^(?:\[poll[^\]]*\])\n+'
-    r'(?:\d+[^\n]*\n+)+'
+    r'(?:[0-9]+[^\n]*\n+)+'
     r'(?:\[/poll\])',
     flags=re.MULTILINE
 )
diff --git a/spirit/topic/favorite/urls.py b/spirit/topic/favorite/urls.py
index 6ae6cca1..22034974 100644
--- a/spirit/topic/favorite/urls.py
+++ b/spirit/topic/favorite/urls.py
@@ -8,6 +8,6 @@ from . import views
 
 
 urlpatterns = [
-    url(r'^(?P<topic_id>\d+)/create/$', views.create, name='create'),
-    url(r'^(?P<pk>\d+)/delete/$', views.delete, name='delete'),
+    url(r'^(?P<topic_id>[0-9]+)/create/$', views.create, name='create'),
+    url(r'^(?P<pk>[0-9]+)/delete/$', views.delete, name='delete'),
 ]
diff --git a/spirit/topic/moderate/urls.py b/spirit/topic/moderate/urls.py
index 264b12d5..81259d1c 100644
--- a/spirit/topic/moderate/urls.py
+++ b/spirit/topic/moderate/urls.py
@@ -8,15 +8,15 @@ from . import views
 
 
 urlpatterns = [
-    url(r'^delete/(?P<pk>\d+)/$', views.delete, name='delete'),
-    url(r'^undelete/(?P<pk>\d+)/$', views.undelete, name='undelete'),
+    url(r'^delete/(?P<pk>[0-9]+)/$', views.delete, name='delete'),
+    url(r'^undelete/(?P<pk>[0-9]+)/$', views.undelete, name='undelete'),
 
-    url(r'^lock/(?P<pk>\d+)/$', views.lock, name='lock'),
-    url(r'^unlock/(?P<pk>\d+)/$', views.unlock, name='unlock'),
+    url(r'^lock/(?P<pk>[0-9]+)/$', views.lock, name='lock'),
+    url(r'^unlock/(?P<pk>[0-9]+)/$', views.unlock, name='unlock'),
 
-    url(r'^pin/(?P<pk>\d+)/$', views.pin, name='pin'),
-    url(r'^unpin/(?P<pk>\d+)/$', views.unpin, name='unpin'),
+    url(r'^pin/(?P<pk>[0-9]+)/$', views.pin, name='pin'),
+    url(r'^unpin/(?P<pk>[0-9]+)/$', views.unpin, name='unpin'),
 
-    url(r'^global-pin/(?P<pk>\d+)/$', views.global_pin, name='global-pin'),
-    url(r'^global-unpin/(?P<pk>\d+)/$', views.global_unpin, name='global-unpin'),
+    url(r'^global-pin/(?P<pk>[0-9]+)/$', views.global_pin, name='global-pin'),
+    url(r'^global-unpin/(?P<pk>[0-9]+)/$', views.global_unpin, name='global-unpin'),
 ]
diff --git a/spirit/topic/notification/urls.py b/spirit/topic/notification/urls.py
index 243e1b66..4e4132aa 100644
--- a/spirit/topic/notification/urls.py
+++ b/spirit/topic/notification/urls.py
@@ -11,6 +11,6 @@ urlpatterns = [
     url(r'^$', views.index, name='index'),
     url(r'^unread/$', views.index_unread, name='index-unread'),
     url(r'^ajax/$', views.index_ajax, name='index-ajax'),
-    url(r'^(?P<topic_id>\d+)/create/$', views.create, name='create'),
-    url(r'^(?P<pk>\d+)/update/$', views.update, name='update'),
+    url(r'^(?P<topic_id>[0-9]+)/create/$', views.create, name='create'),
+    url(r'^(?P<pk>[0-9]+)/update/$', views.update, name='update'),
 ]
diff --git a/spirit/topic/private/urls.py b/spirit/topic/private/urls.py
index b8c8b9d8..4c3208ec 100644
--- a/spirit/topic/private/urls.py
+++ b/spirit/topic/private/urls.py
@@ -12,12 +12,12 @@ urlpatterns = [
     url(r'^author/$', views.index_author, name='index-author'),
 
     url(r'^publish/$', views.publish, name='publish'),
-    url(r'^publish/(?P<user_id>\d+)/$', views.publish, name='publish'),
+    url(r'^publish/(?P<user_id>[0-9]+)/$', views.publish, name='publish'),
 
-    url(r'^(?P<topic_id>\d+)/$', views.detail, kwargs={'slug': "", }, name='detail'),
-    url(r'^(?P<topic_id>\d+)/(?P<slug>[\w-]+)/$', views.detail, name='detail'),
+    url(r'^(?P<topic_id>[0-9]+)/$', views.detail, kwargs={'slug': "", }, name='detail'),
+    url(r'^(?P<topic_id>[0-9]+)/(?P<slug>[\w-]+)/$', views.detail, name='detail'),
 
-    url(r'^invite/(?P<topic_id>\d+)/$', views.create_access, name='access-create'),
-    url(r'^remove/(?P<pk>\d+)/$', views.delete_access, name='access-remove'),
-    url(r'^join/(?P<topic_id>\d+)/$', views.join_in, name='join'),
+    url(r'^invite/(?P<topic_id>[0-9]+)/$', views.create_access, name='access-create'),
+    url(r'^remove/(?P<pk>[0-9]+)/$', views.delete_access, name='access-remove'),
+    url(r'^join/(?P<topic_id>[0-9]+)/$', views.join_in, name='join'),
 ]
diff --git a/spirit/topic/urls.py b/spirit/topic/urls.py
index e59e9c41..3189daaa 100644
--- a/spirit/topic/urls.py
+++ b/spirit/topic/urls.py
@@ -14,12 +14,12 @@ from . import views
 
 urlpatterns = [
     url(r'^publish/$', views.publish, name='publish'),
-    url(r'^publish/(?P<category_id>\d+)/$', views.publish, name='publish'),
+    url(r'^publish/(?P<category_id>[0-9]+)/$', views.publish, name='publish'),
 
-    url(r'^update/(?P<pk>\d+)/$', views.update, name='update'),
+    url(r'^update/(?P<pk>[0-9]+)/$', views.update, name='update'),
 
-    url(r'^(?P<pk>\d+)/$', views.detail, kwargs={'slug': "", }, name='detail'),
-    url(r'^(?P<pk>\d+)/(?P<slug>[\w-]+)/$', views.detail, name='detail'),
+    url(r'^(?P<pk>[0-9]+)/$', views.detail, kwargs={'slug': "", }, name='detail'),
+    url(r'^(?P<pk>[0-9]+)/(?P<slug>[\w-]+)/$', views.detail, name='detail'),
 
     url(r'^active/$', views.index_active, name='index-active'),
 
diff --git a/spirit/user/admin/urls.py b/spirit/user/admin/urls.py
index 1647aa8b..c725c3d2 100644
--- a/spirit/user/admin/urls.py
+++ b/spirit/user/admin/urls.py
@@ -12,5 +12,5 @@ urlpatterns = [
     url(r'^admins/$', views.index_admins, name='index-admins'),
     url(r'^mods/$', views.index_mods, name='index-mods'),
     url(r'^unactive/$', views.index_unactive, name='index-unactive'),
-    url(r'^edit/(?P<user_id>\d+)/$', views.edit, name='edit'),
+    url(r'^edit/(?P<user_id>[0-9]+)/$', views.edit, name='edit'),
 ]
diff --git a/spirit/user/auth/urls.py b/spirit/user/auth/urls.py
index 3e3e9725..860a34f0 100644
--- a/spirit/user/auth/urls.py
+++ b/spirit/user/auth/urls.py
@@ -16,7 +16,7 @@ urlpatterns = [
     url(r'^register/$', views.register, name='register'),
     url(r'^resend-activation/$', views.resend_activation_email, name='resend-activation'),
 
-    url(r'^activation/(?P<pk>\d+)/(?P<token>[0-9A-Za-z_\-\.]+)/$', views.registration_activation,
+    url(r'^activation/(?P<pk>[0-9]+)/(?P<token>[0-9A-Za-z_\-\.]+)/$', views.registration_activation,
         name='registration-activation'),
     url(r'^password-reset/$', views.custom_password_reset,
         {
diff --git a/spirit/user/urls.py b/spirit/user/urls.py
index 1c856a37..c2ee1427 100644
--- a/spirit/user/urls.py
+++ b/spirit/user/urls.py
@@ -14,16 +14,16 @@ urlpatterns = [
     url(r'^email-change/$', views.email_change, name='email-change'),
     url(r'^email-change/(?P<token>[0-9A-Za-z_\-\.]+)/$', views.email_change_confirm, name='email-change-confirm'),
 
-    url(r'^(?P<pk>\d+)/$', views.comments, kwargs={'slug': "", }, name='detail'),
-    url(r'^(?P<pk>\d+)/(?P<slug>[\w-]+)/$', views.comments, name='detail'),
+    url(r'^(?P<pk>[0-9]+)/$', views.comments, kwargs={'slug': "", }, name='detail'),
+    url(r'^(?P<pk>[0-9]+)/(?P<slug>[\w-]+)/$', views.comments, name='detail'),
 
-    url(r'^topics/(?P<pk>\d+)/$', views.topics, kwargs={'slug': "", }, name='topics'),
-    url(r'^topics/(?P<pk>\d+)/(?P<slug>[\w-]+)/$', views.topics, name='topics'),
+    url(r'^topics/(?P<pk>[0-9]+)/$', views.topics, kwargs={'slug': "", }, name='topics'),
+    url(r'^topics/(?P<pk>[0-9]+)/(?P<slug>[\w-]+)/$', views.topics, name='topics'),
 
-    url(r'^likes/(?P<pk>\d+)/$', views.likes, kwargs={'slug': "", }, name='likes'),
-    url(r'^likes/(?P<pk>\d+)/(?P<slug>[\w-]+)/$', views.likes, name='likes'),
+    url(r'^likes/(?P<pk>[0-9]+)/$', views.likes, kwargs={'slug': "", }, name='likes'),
+    url(r'^likes/(?P<pk>[0-9]+)/(?P<slug>[\w-]+)/$', views.likes, name='likes'),
 
     url(r'^menu/$', views.menu, name='menu'),
 
     url(r'^', include(auth_urls, namespace='auth')),
-]
\ No newline at end of file
+]