diff --git a/gitgalaxy/standards/language_standards/languages/swift.py b/gitgalaxy/standards/language_standards/languages/swift.py
index 041005b8..7618a012 100644
--- a/gitgalaxy/standards/language_standards/languages/swift.py
+++ b/gitgalaxy/standards/language_standards/languages/swift.py
@@ -196,7 +196,7 @@
         # 24. import (Dependency Inclusions)
         "import": re.compile(r"^[ \t]*(?:@_exported[ \t]+)?import\s+[a-zA-Z_]\w*", re.M),
         "_dependency_capture": re.compile(
-            r"^[ \t]*(?:@_exported[ \t]+)?import\s+(?:(?:typealias|struct|class|enum|protocol|let|var|func)\s+)?([a-zA-Z_][\w.]+)",
+            r"^[ \t]*(?:@_exported[ \t]+)?import\s+(?:(?:typealias|struct|class|enum|protocol|let|var|func)\s+)?([a-zA-Z_][\w.]*)",
             re.M,
         ),
         # 25. ownership (Authorship Metadata)
diff --git a/tests/extraction/languages/test_swift.py b/tests/extraction/languages/test_swift.py
index 37152785..89721baa 100644
--- a/tests/extraction/languages/test_swift.py
+++ b/tests/extraction/languages/test_swift.py
@@ -235,10 +235,12 @@ def test_swift_class_start_pathological(payload, expected_name):
 # ==============================================================================
 DEPENDENCY_CASES: dict[str, Any] = {
     "valid": [
+        ("import a", "a"),  # issue #2543: single-letter module
         ("import Foundation", "Foundation"),
         ("@_exported import UIKit", "UIKit"),
     ],
     "invalid": [
+        "import",
         "var importData = true",
     ],
     "pathological": [
@@ -267,3 +269,7 @@ def test_swift_dependency_capture_pathological(payload, expected_path):
     assert_pathological_dependency_match(
         SWIFT_RULES["_dependency_capture"], payload, expected_path, "swift._dependency_capture"
     )
+
+
+def test_swift_dependency_capture_redos_immunity():
+    assert_redos_immune(SWIFT_RULES["_dependency_capture"], "import " + "a." * 50000, timeout_sec=3.0)