FindAndReplaceCaseSensitvePhrase.cs

using GroupDocs.Redaction;
using GroupDocs.Redaction.Redactions;
...

using (Document doc = Redactor.Load("sample.docx"))
{
    doc.RedactWith(new ExactPhraseRedaction("John Doe", true /*isCaseSensitive*/, new ReplacementOptions("[censored]")));
    doc.Save();
}

FindAndReplaceExactPhrase.cs

using GroupDocs.Redaction;
using GroupDocs.Redaction.Redactions;
...

using (Document doc = Redactor.Load("sample.docx"))
{
    doc.RedactWith(new ExactPhraseRedaction("John Doe", new ReplacementOptions("[censored]")));
    doc.Save();
}

FindAndReplaceTextBasedOnRegex.cs

using GroupDocs.Redaction;
using GroupDocs.Redaction.Redactions;
...

using (Document doc = Redactor.Load("sample.docx"))
{
    // Regex to match a number having 2 digits, space, 2 digits, space, 6 digits
    doc.RedactWith(new RegexRedaction(@"\\d{2}\\s*\\d{2}[^\\d]*\\d{6}", new ReplacementOptions("[censored]")));
    doc.Save();
}

FindAndReplaceTextWithColoredBox.cs

using GroupDocs.Redaction;
using GroupDocs.Redaction.Redactions;
...

using (Document doc = Redactor.Load("sample.docx"))
{
    doc.RedactWith(new ExactPhraseRedaction("John Doe", true, new ReplacementOptions(System.Drawing.Color.Black)));
    doc.Save();
}