fix: bug when url() route uses the regex kwarg

django_codemod/visitors/urls.py

@@ -1,3 +1,5 @@
+from typing import Sequence
+
 from libcst import Arg, BaseExpression, Call, Name, SimpleString
 from libcst import matchers as m
 from libcst.codemod.visitors import AddImportsVisitor
@@ -97,3 +99,11 @@ def check_route(self, route):
         """Check that route doesn't contain anymore regex."""
         if set(route) & REGEX_SPECIALS_SANS_DASH:
             raise PatternNotSupported(f"Route {route} contains regex")
+
+    def update_call_args(self, node: Call) -> Sequence[Arg]:
+        """Remove keyword argument from first argument of `re_path`."""
+        first_arg, *other_args = node.args
+        if m.matches(first_arg, m.Arg(keyword=m.Name("regex"))):
+            first_arg = Arg(value=first_arg.value)
+            return (first_arg, *other_args)
+        return super().update_call_args(node)

tests/visitors/test_urls.py

@@ -168,3 +168,25 @@ def test_non_captured_group(self) -> None:
             ]
         """
         self.assertCodemod(before, after)
+
+    def test_route_with_kwargs(self) -> None:
+        """Check when `url()` call uses keyword argument `regex`."""
+        before = """
+            from django.conf.urls import url
+
+            urlpatterns = [
+                url(regex=r'^/$', view=views.home, name='home'),
+                url(regex=r'^p/(?P<page>[0-9]+)/$', view=views.page, name='page'),
+                url(regex=r'^hex/(?P<code>[a-f1-9]+)/$', view=views.hex, name='hex'),
+            ]
+        """
+        after = """
+            from django.urls import path, re_path
+
+            urlpatterns = [
+                path('/', view=views.home, name='home'),
+                path('p/<int:page>/', view=views.page, name='page'),
+                re_path(r'^hex/(?P<code>[a-f1-9]+)/$', view=views.hex, name='hex'),
+            ]
+        """
+        self.assertCodemod(before, after)