From 59293c7dd5e272b7b1ff5496aea26a2fb8457b93 Mon Sep 17 00:00:00 2001
From: Bob Mottram <bob@libreserver.org>
Date: Fri, 20 May 2022 11:17:53 +0100
Subject: [PATCH] Hashtags cannot be numbers

---
 tests.py | 2 ++
 utils.py | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/tests.py b/tests.py
index 1dad076c2..bfb827a62 100644
--- a/tests.py
+++ b/tests.py
@@ -5573,6 +5573,7 @@ def _test_valid_hash_tag():
     assert valid_hash_tag('한국어')
     assert valid_hash_tag('테스트')
     assert valid_hash_tag('테_스트')
+    assert valid_hash_tag('c99')
     assert not valid_hash_tag('this-is-invalid')
     assert not valid_hash_tag('ThisIsNotValid!')
     assert not valid_hash_tag('#ThisIsAlsoNotValid')
@@ -5581,6 +5582,7 @@ def _test_valid_hash_tag():
     assert not valid_hash_tag('ThisIsAlsoNotValid"')
     assert not valid_hash_tag('This Is Also Not Valid"')
     assert not valid_hash_tag('This=IsAlsoNotValid"')
+    assert not valid_hash_tag('12345')
 
 
 def _test_markdown_to_html():
diff --git a/utils.py b/utils.py
index dc9abb7ad..6fc1adf7d 100644
--- a/utils.py
+++ b/utils.py
@@ -3535,6 +3535,9 @@ def valid_hash_tag(hashtag: str) -> bool:
     # long hashtags are not valid
     if len(hashtag) >= 32:
         return False
+    # numbers are not permitted to be hashtags
+    if hashtag.isdigit():
+        return False
     if set(hashtag).issubset(VALID_HASHTAG_CHARS):
         return True
     if _is_valid_language(hashtag):