= Invalid header level Shared naming conventions allow teams to collaborate efficiently. This rule checks that all function names match a provided regular expression. == Invalid header == Noncompliant Code Example With default provided regular expression: ``++^[a-z][a-zA-Z0-9]*$++``: ---- void DoSomething (void); ---- === Parameters .format **** ---- ^([A-Z0-9_]*|[a-z0-9_]*)$ ---- ****