
\brief Create range validator

Creates a new instance of a range validator.

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The user data must be provide a range of numbers, decimal
or integer, which are separated by a space. If it should be
a specific value then one value is enough to provide.

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Range example: 100 200<br>
Exact value example: 100

\param User data (range)

\info The lower border must be passed as the first value followed
      by the upper border.
