The court has full authority and jurisdiction to consider any question of laches, estoppel, and other infirmities in the position and claims of the defendants, to question the legality of the proceedings sought by the plaintiff to be confirmed by the court, and to pass upon and determine them. The court, in inquiring into the regularity, legality, and correctness of the proceedings sought by the board of fire commissioners in its petition to be examined, approved, and confirmed by the court, must disregard any error, irregularity, or omission which does not affect the substantial rights of the parties to the special proceedings. The court may approve and confirm the proceedings in part, and disapprove and declare illegal or invalid other or subsequent parts of the proceedings, or it may approve and confirm all of the proceedings, and make and enter its decree accordingly.