Question

I want to use Regex.Replace method.I will search
“new long?((long)” expressions in very long string and will make the following change.

Before:

OracleParameter[] array = new OracleParameter[]
{
    new OracleParameter("p_op_adi", OracleDbType.Varchar2, p_op_adi, ParameterDirection.Input),
    new OracleParameter("p_tip_no", OracleDbType.Int64, p_tip_no, ParameterDirection.Input),
    new OracleParameter("p_islem", OracleDbType.Varchar2, p_islem, ParameterDirection.Input),
    new OracleParameter("p_raise", OracleDbType.Varchar2, p_raise, ParameterDirection.Input),
    new OracleParameter("p_durum", OracleDbType.Int64, null, ParameterDirection.Output),
    new OracleParameter("p_mesaj", OracleDbType.Varchar2, 4000, null, ParameterDirection.Output)
};
sMan.ExecuteSP("FRM_USER.user_yetki_kontrol_islem", array);
p_durum = ((array[4].Value != System.DBNull.Value) ? new long?((long)array[4].Value) : null);
p_mesaj = array[5].Value.ToString();

After Regex:

OracleParameter[] array = new OracleParameter[]
{
    new OracleParameter("p_op_adi", OracleDbType.Varchar2, p_op_adi, ParameterDirection.Input),
    new OracleParameter("p_tip_no", OracleDbType.Int64, p_tip_no, ParameterDirection.Input),
    new OracleParameter("p_islem", OracleDbType.Varchar2, p_islem, ParameterDirection.Input),
    new OracleParameter("p_raise", OracleDbType.Varchar2, p_raise, ParameterDirection.Input),
    new OracleParameter("p_durum", OracleDbType.Int64, null, ParameterDirection.Output),
    new OracleParameter("p_mesaj", OracleDbType.Varchar2, 4000, null, ParameterDirection.Output)
};
sMan.ExecuteSP("FRM_USER.user_yetki_kontrol_islem", array);
p_durum = abcde(array[4].Value);
p_mesaj = array[5].Value.ToString();

Note that I must catch array index number 4.

Answer 1

This code should do exaclty what you want:

class Program
{
    static void Main(string[] args)
    {
        string input = @"OracleParameter[] array = new OracleParameter[]
            {
                new OracleParameter('p_op_adi', OracleDbType.Varchar2, p_op_adi, ParameterDirection.Input),
                p_durum = ((array[4].Value != System.DBNull.Value) ? new long?((long)array[4].Value) : null);
                p_durum = ((array[4].Value != System.DBNull.Value) ? new long?((long)array[4].Value) : null);
            ";

        string pattern = @"^(?<varname>[^=]*)=.*new long\?\(\(long\)(?<arrayval>[^)]*).*?$";
        string replacement = "${varname} = abcde(${arrayval});";

        string output = Regex.Replace(input, pattern, replacement, RegexOptions.Multiline);
        Console.WriteLine(output);
        Console.ReadKey();
    }
}

It gatters variable name and array value and uses these as substitutions in the replacement part.