////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary> Constructor. </summary>
///
/// <remarks> Lucas Alves, 15/01/2016. </remarks>
///
/// <param name="a"> The RegularExpression to process. </param>
/// <param name="b"> The RegularExpression to process. </param>
////////////////////////////////////////////////////////////////////////////////////////////////////
public Concatenation(RegularExpression a, RegularExpression b)
{
_a = a;
_b = b;
}