Advanced search for Text signatures

GroupDocs.Signature provides TextSearchOptions class to specify different options to search for Text Signatures.

Here are the steps to search for text signatures within the document with GroupDocs.Signature:

This example shows how to make advanced search for Text signature in the document.

using (Signature signature = new Signature(sample.pdf))
    // setup search options
    TextSearchOptions searchOptions = new TextSearchOptions()
        // specify special pages to search on
        AllPages = false,
        // single page number
        PageNumber = 1,
        // setup extended search in pages setup
        PagesSetup = new PagesSetup() { FirstPage = true, LastPage = true, OddPages = false, EvenPages = false },
        // specify text match type
        MatchType = TextMatchType.Exact,
        // specify text pattern to search
        Text = "John Smith"

    // search document
    List<TextSignature> signatures = signature.Search<TextSignature>(searchOptions);

    // output signatures
    foreach (TextSignature textSignature in signatures)
        if (textSignature != null)
            Console.Write($"Found Text signature: {textSignature.SignatureImplementation} with text {textSignature.Text}.");
            Console.WriteLine($"Location at {textSignature.Left}-{textSignature.Top}. Size is {textSignature.Width}x{textSignature.Height}.");

More resources

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

Free Online App

Along with full-featured .NET library we provide simple, but powerful free Apps.

You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.