chore: improve error messages for invalid characters in variables nam…

…es (#536)

* chore: improve error messages for invalid characters in variables names

ECALC-647

src/libecalc/presentation/yaml/validation_errors.py

@@ -22,6 +22,8 @@
 CUSTOM_MESSAGES = {
     "missing": "This keyword is missing, it is required",
     "extra_forbidden": "This is not a valid keyword",
+    "string_pattern_mismatch": "The string/name contains illegal characters. Allowed characters are: {pattern}. "
+    "A good start can be to check the string/name for space, which is not allowed.",
 }
 
 

src/tests/libecalc/input/mappers/variables_mapper/test_timeseries.py

@@ -268,7 +268,11 @@ def test_invalid_time_series_headers(self, header):
                     interpolation_type=None,
                 )
             )
-        assert "String should match pattern '^[A-Za-z][A-Za-z0-9_.,\\-\\s#+:\\/]*$'" in str(ve.value)
+        assert (
+            "SIM1:\nDEFAULT.headers[0]:\t"
+            "The string/name contains illegal characters. "
+            "Allowed characters are: ^[A-Za-z][A-Za-z0-9_.,\\-\\s#+:\\/]*$"
+        ) in str(ve.value)
 
     @pytest.mark.parametrize(
         "header",
@@ -321,7 +325,11 @@ def test_invalid_resource_names(self, resource_name):
                     interpolation_type=None,
                 )
             )
-        assert "String should match pattern '^[A-Za-z][A-Za-z0-9_]*$'" in str(ve.value)
+        assert (
+            f"\n{resource_name}:\nDEFAULT.name:\t"
+            f"The string/name contains illegal characters. "
+            f"Allowed characters are: ^[A-Za-z][A-Za-z0-9_]*$"
+        ) in str(ve.value)
 
     def test_interpretation_of_interpolation_type_for_default_resource(self):
         """Check default interpolation for DEFAULT time series."""