diff --git a/pytest_splunk_addon/standard_lib/requirement_tests/test_generator.py b/pytest_splunk_addon/standard_lib/requirement_tests/test_generator.py
index c99a0367..676daeb5 100644
--- a/pytest_splunk_addon/standard_lib/requirement_tests/test_generator.py
+++ b/pytest_splunk_addon/standard_lib/requirement_tests/test_generator.py
@@ -97,7 +97,7 @@ def strip_syslog_header(self, raw_event):
             stripped_header = regex_rfc5424.group(3)
             return stripped_header
         regex_rfc3164 = re.search(
-            r"([A-Z][a-z][a-z]\s{1,2}\d{1,2}\s\d{2}[:]\d{2}[:]\d{2})\s+([\w][\w\d\.@-]*)\s(.*)$",
+            r"([A-Z][a-z][a-z]\s{1,2}\d{1,2}\s\d{2}[:]\d{2}[:]\d{2})\s+([\w][\w\d\.@-]*)\s\w*:?(.*)$",
             raw_event,
         )
         if regex_rfc3164:
diff --git a/tests/unit/tests_standard_lib/test_requirement_tests/test_test_generator.py b/tests/unit/tests_standard_lib/test_requirement_tests/test_test_generator.py
index 14c11441..034b759f 100644
--- a/tests/unit/tests_standard_lib/test_requirement_tests/test_test_generator.py
+++ b/tests/unit/tests_standard_lib/test_requirement_tests/test_test_generator.py
@@ -106,7 +106,7 @@ def test_extract_params():
             ["requirement.log"],
             [True],
             ["syslog"],
-            {"event": ["<34>Oct 11 22:14:15 machine1 event_1"]},
+            {"event": ["<34>Oct 11 22:14:15 machine1 pr1:event_1"]},
             [["model_1:dataset_1", "model_2:dataset_2"]],
             [{"field1": "value1", "field2": "value2"}, {"field3": "value3"}],
             [