using System;

using System.Globalization;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        /*

        67185019800138111td.2018.06.29.csv.asc.18.07.01_23.05.csv

        FX Spots Forwards Summary2_29-Jun-2018.csv

        QUINTIL_IRS_Open_20180629.csv

        Share Register_290618.pdf

        PositionFileAP10180629.xml

        301__PAMP_CAP_MATND_CSA_08/01/2018 02393748_0.xls

​

        */

        //${day}-${month}-${year}

        string input = "FX Spots Forwards Summary2_29-Jun-2018.csv";

        /*

        // Replace [MM.dd.yyyy]

        input = Regex.Replace(input, 

            "\\b(?<month>\\d{1,2}).(?<day>\\d{1,2}).(?<year>\\d{2,4})\\b",

            "%", RegexOptions.None,

            TimeSpan.FromMilliseconds(150));

        // Replace [MM/dd/yyyy]

        input = Regex.Replace(input, 

            "\\b(?<month>\\d{1,2})/(?<day>\\d{1,2})/(?<year>\\d{2,4})\\b",

            "%", RegexOptions.None,

            TimeSpan.FromMilliseconds(150));

        // Replace [MM-dd-yyyy]

        input = Regex.Replace(input, 

            "\\b(?<month>\\d{1,2})-(?<day>\\d{1,2})-(?<year>\\d{2,4})\\b",

            "%", RegexOptions.None,

            TimeSpan.FromMilliseconds(150));

        */

        // Replace [dd-MMM-yyyy]

        // \S Matches any white-space character. 

        // \d Matches any decimal digit. 

        // \w Matches any word character. 

        input = Regex.Replace(input, 

            "\\S(?<day>\\d{2})-(?<month>\\w{3})-(?<year>\\d{4})\\b", 

            "%", RegexOptions.None,

            TimeSpan.FromMilliseconds(150));        

        string output = input;

        Console.WriteLine(output);

    }

}