GNU objcopy accepts the --wildcard flag to allow wildcard matching on symbol-related flags. (Note: it's implicitly true for section flags).
The basic syntax is to allow *, ?, \, and  which work similarly to how they work in a shell. Additionally, starting a wildcard with ! causes that wildcard to prevent it from matching a flag.
Update GlobPattern in libSupport to handle a few more cases. It does not fully match the fnmatch used by GNU objcopy since named character classes (e.g. [[:digit:]]) are not supported, but this should support most existing use cases (mostly just * is what's used anyway).