improve PR title validation script: refine regex and add detailed format guidance

Author: allnes

scripts/check_pr_title.py

@@ -13,7 +13,7 @@ def main():
 
     # Regex for [TASK] format
     task_pattern = re.compile(
-        r"^\[TASK\]\s*\d+-\d+\.\s+[А-ЯЁ][а-яё]+ [А-ЯЁ][а-яё]+ [А-ЯЁ][а-яё]+\.\s+[0-9А-Яа-я\-]+\. .+$"
+        r"^\[TASK\]\s*\d+-\d+\.\s+[А-ЯЁ][а-яё]+ [А-ЯЁ][а-яё]+ [А-ЯЁ][а-яё]+\.\s+[0-9А-Яа-я\-]+\. .+\.$"
     )
 
     # Regex for [DEV] format
@@ -24,7 +24,12 @@ def main():
         print("✅ PR title is valid")
         sys.exit(0)
     else:
+        # Print detailed guidance with templates and example
         print("❌ Invalid PR title format")
+        print("\nAllowed PR title formats:")
+        print("- [TASK] <Task Number>-<Variant number>. <Last Name> <First Name> <Middle Name>. <Group number>. <Task name>.")
+        print("  Example: [TASK] 2-12. Иванов Иван Иванович. 2341-а234. Вычисление суммы элементов вектора.")
+        print("- [DEV] <any text>")
         sys.exit(1)