flymake-warning-re

flymake-warning-re is a variable defined in `flymake.el'.
Its value is

"^[wW]arning"

• This variable is an alias for `flymake-warning-predicate'.
• This variable is obsolete since 24.4;
  use `flymake-warning-predicate' instead.
• This variable may be risky if used as a file-local variable.

Documentation:
Predicate matching against error text to detect a warning.
Takes a single argument, the error's text and should return non-nil
if it's a warning.
Instead of a function, it can also be a regular expression.