How to mask string?

Question

I have a string with value \"1131200001103\".

How can I display it as a string in this format \"11-312-001103\" using Response.Write(value)?

Thanks

Answer 1

You can try a regular expression and put this inside an extension method ToMaskedString()

public static class StringExtensions
{
    public static string ToMaskedString(this String value)
    {
        var pattern = "^(/d{2})(/d{3})(/d*)$";
        var regExp = new Regex(pattern);
        return regExp.Replace(value, "$1-$2-$3");
    }
}

Then call

respne.Write(value.ToMaskedString());