public class SearchAndRepalce : Darrenstring

        {

            public bool replaced;

            private string stringout;

            public SearchAndRepalce()

            {

            }

            public string searchandreplace(string inputstring, string searchstring, string replacestring, bool replaceall)

            {

                if (replaceall)

                {

                    replaced=true;

                    stringout = inputstring.Replace(searchstring, replacestring);

                    return stringout;

                }

                else

                {

                    Matchpattern A = new Matchpattern(inputstring, searchstring);

                    if (A.ismatch)

                    {

                        stringout = A.Before() + replacestring+A.After();

                        replaced=true;

                        return stringout;

                    }

                    else

                    {

                        replaced = false;

                        return null;

                    }

                }

            }

        }

private void Confirm_Click(object sender, EventArgs e)

        {

            Darrenstring.SearchAndRepalce A = new Darrenstring.SearchAndRepalce();

            Textout.Text = A.searchandreplace(Text.Text, Searchstring.Text, Replacestring.Text, Rplaceall.Checked);

        }