utils: handle number suffixed old sdist names

Resolves: python-poetry#6996

src/poetry/utils/patterns.py

@@ -14,6 +14,6 @@
 )
 
 sdist_file_re = re.compile(
-    r"^(?P<namever>(?P<name>.+?)-(?P<ver>\d.*?))"
+    r"^(?P<namever>(?P<name>.+?)-(?P<ver>\d[^-]*?))"
     r"(\.sdist)?\.(?P<format>(zip|tar(\.(gz|bz2|xz|Z))?))$"
 )

tests/utils/test_patterns.py

@@ -40,3 +40,34 @@ def test_wheel_file_re(filename: str, expected: dict[str, str | None]) -> None:
     groups = match.groupdict()
 
     assert groups == expected
+
+
+@pytest.mark.parametrize(
+    ["filename", "expected"],
+    [
+        (
+            "poetry_core-1.5.0.tar.gz",
+            {
+                "namever": "poetry_core-1.5.0",
+                "name": "poetry_core",
+                "ver": "1.5.0",
+                "format": "tar.gz",
+            },
+        ),
+        (
+            "flask-restful-swagger-2-0.35.tar.gz",
+            {
+                "namever": "flask-restful-swagger-2-0.35",
+                "name": "flask-restful-swagger-2",
+                "ver": "0.35",
+                "format": "tar.gz",
+            },
+        ),
+    ],
+)
+def test_sdist_file_re(filename: str, expected: dict[str, str | None]) -> None:
+    match = patterns.sdist_file_re.match(filename)
+    assert match is not None
+    groups = match.groupdict()
+
+    assert groups == expected