conversion file pattern <-> regex pattern

To check if a file path 'path' matches &backupskip,
the naive try

path ~=# &backupskip

does not work because &backupskip is a file pattern
as used for autocmd events. Is there a function
'file2regex()' that converts &backupskip to a Vim regex
pattern so that

path ~=# file2regex(&backupskip)

is true if and only if path matches &backupskip?

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