The following snippet will convert a string with wildcards to a appropriate regexp, i.e.
parse_wildcards("foobar") # => /\Afoo.bar\z/
parse_wildcards("") # => /\A.\z/
parse_wildcards("[") # => /\A[\z/

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def parse_wildcards(string)
matching_parts = string.split('', -1).collect { |part| Regexp.escape(part) }
/\A#{matching_parts.join(".")}\z/
end