[Infrastructure] .clang-tidy: Fix ignore patterns for special names (#13209)

Author: vkucera

.clang-tidy

@@ -1,17 +1,16 @@
 CheckOptions:
-  - { key: CheckPathRegex, value: ".*/O2/.*" }
   # Naming conventions
   - { key: readability-identifier-naming.ClassCase, value: CamelCase }
   - { key: readability-identifier-naming.ClassMemberPrefix, value: m }
   - { key: readability-identifier-naming.ConceptCase, value: CamelCase }
   - { key: readability-identifier-naming.ConstexprVariableCase, value: CamelCase }
-  - { key: readability-identifier-naming.ConstexprVariableIgnoredRegexp, value: "^k[A-Z].*$" }  # Allow "k" prefix.
+  - { key: readability-identifier-naming.ConstexprVariableIgnoredRegexp, value: "^k[A-Z][a-zA-Z0-9]*$" }  # Allow "k" prefix.
   - { key: readability-identifier-naming.EnumCase, value: CamelCase }
   - { key: readability-identifier-naming.EnumConstantCase, value: CamelCase }
-  - { key: readability-identifier-naming.EnumConstantIgnoredRegexp, value: "^k[A-Z].*$" }  # Allow "k" prefix.
+  - { key: readability-identifier-naming.EnumConstantIgnoredRegexp, value: "^k?[A-Z][a-zA-Z0-9_]*$" }  # Allow "k" prefix and underscores.
   - { key: readability-identifier-naming.FunctionCase, value: camelBack }
   - { key: readability-identifier-naming.MacroDefinitionCase, value: UPPER_CASE }
-  - { key: readability-identifier-naming.MacroDefinitionIgnoredRegexp, value: "^[A-Z]+(_[A-Z]+)*_$" }  # Allow the trailing underscore in header guards.
+  - { key: readability-identifier-naming.MacroDefinitionIgnoredRegexp, value: "^[A-Z][A-Z0-9_]*_$" }  # Allow the trailing underscore in header guards.
   - { key: readability-identifier-naming.MemberCase, value: camelBack }
   - { key: readability-identifier-naming.NamespaceCase, value: lower_case }
   - { key: readability-identifier-naming.ParameterCase, value: camelBack }