Redact Excel Files in C# | Excel XLSX Redaction

redact-excel.cs

using (GroupDocs.Redaction.Redactor redactor = new GroupDocs.Redaction.Redactor("SalesSeptember.xlsx"))
{
    var filter = new GroupDocs.Redaction.Redactions.CellFilter()
    {
        ColumnIndex = 1, // zero-based 2nd column
        WorkSheetName = "Customers"
    };
    var expression = new System.Text.RegularExpressions.Regex("^\\w+([-+.']\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");
    GroupDocs.Redaction.RedactorChangeLog changeLog = redactor.Apply(new GroupDocs.Redaction.Redactions.CellColumnRedaction(filter, expression, new GroupDocs.Redaction.Redactions.ReplacementOptions("[customer email]")));
    if (changeLog.Status != GroupDocs.Redaction.RedactionStatus.Failed)
    {
        redactor.Save(new GroupDocs.Redaction.Options.SaveOptions() { AddSuffix = true });
    };
}