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Replacing text to an image

I need to search and replace text to an image, but the text search need to be a Regex, and can be distributed across several Runs, so looking for it in each Run isn’t a good approach, however the “doc.Range.Replace” method can help me with it with the Regex support.

But, I cannot realize that, because this replacement, isn’t a text replacement, but is based on removing several Runs, and adding a Image object in their place.

Is there any way which I could get the firt or last Run affected by a replacement, and so get this position (siblings and /or parent objects), to insert there an Image object ?
Hi Luciano,

Thanks for your inquiry.

You can achieve your requirement by implementing IReplacingCallback interface. Please use the same approach shared at following documentation link to find text and insert the image. See the highlighted code snippet below.

Hope this helps you. Please let us know if you have any more queries.

Document doc = new Document(MyDir + "in.docx");

doc.Range.Replace(new Regex(@"text replace with image"), new ReplaceEvaluatorImage(MyDir + "in.jpg"), false);

doc.Save(MyDir + "Out.docx");

public class ReplaceEvaluatorImage : IReplacingCallback


String imagepath;

public ReplaceEvaluatorImage(String path)


imagepath = path;


ReplaceAction IReplacingCallback.Replacing(ReplacingArgs e)


// This is a Run node that contains either the beginning or the complete match.

Node currentNode = e.MatchNode;

// The first (and may be the only) run can contain text before the match,

// in this case it is necessary to split the run.

if (e.MatchOffset > 0)

currentNode = SplitRun((Run)currentNode, e.MatchOffset);

// This array is used to store all nodes of the match for further removing.

ArrayList runs = new ArrayList();

// Find all runs that contain parts of the match string.

int remainingLength = e.Match.Value.Length;

while (

(remainingLength > 0) &&

(currentNode != null) &&

(currentNode.GetText().Length <= remainingLength))



remainingLength = remainingLength - currentNode.GetText().Length;

// Select the next Run node.

// Have to loop because there could be other nodes such as BookmarkStart etc.



currentNode = currentNode.NextSibling;


while ((currentNode != null) && (currentNode.NodeType != NodeType.Run));


// Split the last run that contains the match if there is any text left.

if ((currentNode != null) && (remainingLength > 0))


SplitRun((Run)currentNode, remainingLength);



// Create Document Buidler

DocumentBuilder builder = new DocumentBuilder(e.MatchNode.Document as Document);

builder.MoveTo((Run)runs[runs.Count - 1]);


// Now remove all runs in the sequence.

foreach (Run run in runs)


// Signal to the replace engine to do nothing because we have already done all what we wanted.

return ReplaceAction.Skip;


private static Run SplitRun(Run run, int position)


Run afterRun = (Run)run.Clone(true);

afterRun.Text = run.Text.Substring(position);

run.Text = run.Text.Substring(0, position);

run.ParentNode.InsertAfter(afterRun, run);

return afterRun;



How to restrict this kind of find/replace inside a set of table rows ? I should iterate each row and invoke the replace in each one ?

Hi Luciano,

Thanks for your inquiry. You can use Node.Range.Replace to achieve your requirements. In this case, you need to use Row.Range.Replace method. Please check the highlighted code snippet below and let us know if you have any more queries.

Document doc = new Document(MyDir + "in.docx");

foreach (Table table in doc.GetChildNodes(NodeType.Table, true))


table.FirstRow.Range.Replace(new Regex(@"Image"), new ReplaceEvaluatorImage(MyDir + "in.png"), false);


doc.Save(MyDir + "Out.docx");