Git issue 525: segfault when fuzzy matching empty list

regex_3/_regex_core.py

@@ -2111,6 +2111,9 @@ def get_firstset(self, reverse):
         return fs or set([None])
 
     def _compile(self, reverse, fuzzy):
+        if not self.branches:
+            return []
+
         code = [(OP.BRANCH, )]
         for b in self.branches:
             code.extend(b.compile(reverse, fuzzy))

regex_3/regex.py

@@ -241,7 +241,7 @@
   "VERSION1", "X", "VERBOSE", "W", "WORD", "error", "Regex", "__version__",
   "__doc__", "RegexFlag"]
 
-__version__ = "2.5.140"
+__version__ = "2.5.141"
 
 # --------------------------------------------------------------------
 # Public interface.

regex_3/test_regex.py

@@ -4326,6 +4326,9 @@ def test_hg_bugs(self):
         self.assertEqual(regex.match(r'(?(?!a).|..)', 'ab').span(), (0, 2))
         self.assertEqual(regex.match(r'(?(?!b).|..)', 'ab').span(), (0, 1))
 
+        # Git issue 525: segfault when fuzzy matching empty list
+        self.assertEqual(regex.match(r"(\L<foo>){e<=5}", "blah", foo=[]).span(), (0, 0))
+
     def test_fuzzy_ext(self):
         self.assertEqual(bool(regex.fullmatch(r'(?r)(?:a){e<=1:[a-z]}', 'e')),
           True)

setup.py

@@ -7,7 +7,7 @@
 
 setup(
     name='regex',
-    version='2023.12.25',
+    version='2024.4.16',
     description='Alternative regular expression module, to replace re.',
     long_description=long_description,
     long_description_content_type='text/x-rst',