@@ -183,6 +183,11 @@ ___
   Use :func:`pty.openpty` instead.
   (Contributed by Nikita Sobolev in :gh:`118824`.)
 
+shlex
+-----
+
+* :func:`shlex.quote` now always quotes its input instead of testing a regex
+
 sqlite3
 -------
 

diff --git a/Lib/shlex.py b/Lib/shlex.py
@@ -8,7 +8,6 @@
 # changes to tokenize more like Posix shells by Vinay Sajip, July 2016.
 
 import os
-import re
 import sys
 from collections import deque
 
@@ -318,15 +317,8 @@ def join(split_command):
     return ' '.join(quote(arg) for arg in split_command)
 
 
-_find_unsafe = re.compile(r'[^\w@%+=:,./-]', re.ASCII).search
-
 def quote(s):
     """Return a shell-escaped version of the string *s*."""
-    if not s:
-        return "''"
-    if _find_unsafe(s) is None:
-        return s
-
     # use single quotes, and put single quotes into double quotes
     # the string $'b is then quoted as '$'"'"'b'
     return "'" + s.replace("'", "'\"'\"'") + "'"

diff --git a/Lib/test/test_shlex.py b/Lib/test/test_shlex.py
@@ -323,12 +323,10 @@ def testUnicodeHandling(self):
         self.assertEqual(list(s), ref)
 
     def testQuote(self):
-        safeunquoted = string.ascii_letters + string.digits + '@%_-+=:,./'
         unicode_sample = '\xe9\xe0\xdf'  # e + acute accent, a + grave, sharp s
         unsafe = '"`$\\!' + unicode_sample
 
         self.assertEqual(shlex.quote(''), "''")
-        self.assertEqual(shlex.quote(safeunquoted), safeunquoted)
         self.assertEqual(shlex.quote('test file name'), "'test file name'")
         for u in unsafe:
             self.assertEqual(shlex.quote('test%sname' % u),
@@ -339,9 +337,9 @@ def testQuote(self):
 
     def testJoin(self):
         for split_command, command in [
-            (['a ', 'b'], "'a ' b"),
-            (['a', ' b'], "a ' b'"),
-            (['a', ' ', 'b'], "a ' ' b"),
+            (['a ', 'b'], "'a ' 'b'"),
+            (['a', ' b'], "'a' ' b'"),
+            (['a', ' ', 'b'], "'a' ' ' 'b'"),
             (['"a', 'b"'], '\'"a\' \'b"\''),
         ]:
             with self.subTest(command=command):

diff --git a/Misc/NEWS.d/next/Library/2024-05-28-17-24-19.gh-issue-119670.P4J3vX.rst b/Misc/NEWS.d/next/Library/2024-05-28-17-24-19.gh-issue-119670.P4J3vX.rst
@@ -0,0 +1 @@
+:func:`shlex.quote` now always quotes its input instead of testing a regex
-Original file line number
+Diff line change
@@ Expand Up / @@ -183,6 +183,11 @@ ___ @@
       Use :func:`pty.openpty` instead.
       (Contributed by Nikita Sobolev in :gh:`118824`.)
+    shlex
+    -----
+    * :func:`shlex.quote` now always quotes its input instead of testing a regex
     sqlite3
     -------
@@ Expand Down @@
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		:func:`shlex.quote` now always quotes its input instead of testing a regex