add regex to attribute and argument name checks

Author: christopher-wild

.pylintrc

@@ -168,7 +168,7 @@ argument-naming-style=snake_case
 # Regular expression matching correct argument names. Overrides argument-
 # naming-style. If left empty, argument names will be checked with the set
 # naming style.
-#argument-rgx=
+argument-rgx=^[a-z][a-z0-9]*((_[a-z0-9]+)*)?$
 
 # Naming style matching correct attribute names.
 attr-naming-style=snake_case
@@ -196,7 +196,7 @@ class-attribute-naming-style=any
 # Regular expression matching correct class attribute names. Overrides class-
 # attribute-naming-style. If left empty, class attribute names will be checked
 # with the set naming style.
-#class-attribute-rgx=
+class-attribute-rgx=^[a-z][a-z0-9]*((_[a-z0-9]+)*)?$
 
 # Naming style matching correct class constant names.
 class-const-naming-style=UPPER_CASE