refactor: update regex pattern syntax and improve code readability

Author: rongxin-liu

check50/_simple.py

@@ -59,7 +59,7 @@ def _compile_check(name, check):
     if check_name[0].isdigit():
         check_name = f"_{check_name}"
 
-    if not re.match("\w+", check_name):
+    if not re.match(r"\w+", check_name):
         raise CompileError(
                 _("{} is not a valid name for a check; check names should consist only of alphanumeric characters, underscores, and spaces").format(name))
 

check50/regex.py

@@ -2,7 +2,7 @@
 
 
 def decimal(number):
-    """
+    r"""
     Create a regular expression to match the number exactly:
 
     In case of a positive number::

check50/runner.py

@@ -160,7 +160,8 @@ def wrapper(run_root_dir, dependency_state):
             finally:
                 result.log = _log if len(_log) <= max_log_lines else ["..."] + _log[-max_log_lines:]
                 result.data = _data
-                return result, state
+
+            return result, state
         return wrapper
     return decorator