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fix(route): match page routes case-insensitively like React Router #7599

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fix(route): match page routes case-insensitively like React Router #7599

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1 change: 1 addition & 0 deletions news/+route-case-insensitive.bugfix.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Match page routes case-insensitively on the backend, as React Router does on the frontend, so `on_load` events and `router.page.path` resolve for a URL like `/About` instead of falling back to the 404 page.
3 changes: 2 additions & 1 deletion reflex/route.py
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Expand Up @@ -180,7 +180,8 @@ def get_route_regex(keyworded_route: str) -> re.Pattern:
# Join the regex parts and compile the regex
regex_pattern = "".join(regex_parts)
regex_pattern = f"^{regex_pattern}/?$"
return re.compile(regex_pattern)
# React Router matches route paths case-insensitively by default.
return re.compile(regex_pattern, re.IGNORECASE)

@cubic-dev-ai cubic-dev-ai Bot Oct 19, 2026

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P2: re.IGNORECASE enables Unicode case folding, so an ASCII route such as /i also matches /İ and /ı (and /s matches /ſ). Compile with ASCII-restricted case folding to avoid routing Unicode URLs that React Router treats as unmatched.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At reflex/route.py, line 184:

<comment>`re.IGNORECASE` enables Unicode case folding, so an ASCII route such as `/i` also matches `/İ` and `/ı` (and `/s` matches `/ſ`). Compile with ASCII-restricted case folding to avoid routing Unicode URLs that React Router treats as unmatched.</comment>

<file context>
@@ -180,7 +180,8 @@ def get_route_regex(keyworded_route: str) -> re.Pattern:
     regex_pattern = f"^{regex_pattern}/?$"
-    return re.compile(regex_pattern)
+    # React Router matches route paths case-insensitively by default.
+    return re.compile(regex_pattern, re.IGNORECASE)
 
 
</file context>
Suggested change
return re.compile(regex_pattern, re.IGNORECASE)
return re.compile(regex_pattern, re.IGNORECASE | re.ASCII)



def get_router(routes: list[str]) -> Callable[[str], str | None]:
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17 changes: 17 additions & 0 deletions tests/units/test_route.py
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Expand Up @@ -135,6 +135,23 @@ def test_get_router_splat_catchall(path: str, expected: str | None):
assert router(path) == expected


@pytest.mark.parametrize(
("path", "expected"),
[
("/About", "about"),
("/ABOUT/", "about"),
("/Posts/42", "posts/[id]"),
("/team", "Team"),
("/", "index"),
],
)
def test_get_router_ignores_case(path: str, expected: str):
# React Router renders a page for any casing of its path, so the backend
# must resolve the same route to run its on_load events.
router = get_router(["index", "about", "posts/[id]", "Team"])
assert router(path) == expected


@pytest.mark.parametrize(
("path", "expected"),
[
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