How far to search for a match.
An integer corresponding to the distance the pattern can be from the expected location. Default value is 1000.
A value of 0 indicates an exact location. The higher the value the farther away the pattern can be in order to be considered a match. If the DocumentComparer finds a match this many characters away from the expected location, this will add 1.0 to the overall score of the match where 0.0 indicates a perfect match.