using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        string formula1 = "(BA08)-(BA08_)";

        FixFormula(formula1);

        string formula2 = "(BA08 )-( BA08_        )";

        FixFormula(formula2);

        string formula3 = "(BA08*2)-(BA08_)";

        FixFormula(formula3);

        string formula4 = "(BA08)-(BA08_-1)";

        FixFormula(formula4);

    }

​

    public static void FixFormula(string formula)

    {

        Console.WriteLine("Formula Original: " + formula);

        var regex = new Regex(@"\((\s*?\w*?_{0,1}\s*?)\)");

        var matchVariables = regex.Match(formula);

        while (matchVariables.Success)

        {

            formula = formula.Replace("(" + matchVariables.Groups[1].Value + ")", matchVariables.Groups[1].Value.Trim());

            matchVariables = matchVariables.NextMatch();

        }

​

        Console.WriteLine("Formula Final: " + formula);

        Console.WriteLine();

    }

}