SigmaString slice with start after end results in empty string

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pySigma"
-version = "0.8.6"
+version = "0.8.7"
 license = "LGPL-2.1-only"
 description = "Sigma rule processing and conversion tools"
 authors = ["Thomas Patzke <[email protected]>"]

sigma/types.py

@@ -132,9 +132,9 @@ def __getitem__(self, idx : Union[int, slice]) -> "SigmaString":
             end = length + end
 
         # Range checks
-        if start > end:
+        if start > end or start >= length:
             return SigmaString("")
-        if start < 0 or end < 0 or start >= length or (end != inf and end > length):
+        if start < 0 or end < 0 or (end != inf and end > length):
             raise IndexError("SigmaString index out of range")
 
         i = 0               # Pointer to SigmaString element

tests/test_types.py

@@ -221,8 +221,7 @@ def test_string_index_slice_empty_result(sigma_string):
     assert sigma_string[4:2] == SigmaString("")
 
 def test_string_index_slice_start_after_end(sigma_string):
-    with pytest.raises(IndexError, match="out of range"):
-        assert sigma_string[100:]
+    assert sigma_string[100:] == SigmaString("")
 
 def test_string_index_slice_open_start_negative_end(sigma_string):
     assert sigma_string[:-1] == SigmaString("*Test*Str\\*ing")