RegEx represents a regular expression. The Options field may contain individual characters defining the way in which the pattern should be applied, and must be sorted. Valid options as of this writing are 'i' for case insensitive matching, 'm' for multi-line matching, 'x' for verbose mode, 'l' to make \w, \W, and similar be locale-dependent, 's' for dot-all mode (a '.' matches everything), and 'u' to make \w, \W, and similar match unicode. The value of the Options parameter is not verified before being marshaled into the BSON format.

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