How to find a TextRange in RichTextBox

Question

In my System.Windows.Controls.RichTextBox, I would like to find a TextRange of a given word. However, it is not giving me the correct PositionAtOffset after the first found word. The first one is correct, and then for the next found words, the position is not correct. Am I using the correct methods?

Loop through listOfWords

Word= listOfWords[j].ToString();

startPos = new TextRange(transcriberArea.Document.ContentStart, transcriberArea.Document.ContentEnd).Text.IndexOf(Word.Trim());

 leftPointer = textPointer.GetPositionAtOffset(startPos + 1, LogicalDirection.Forward);

rightPointer = textPointer.GetPositionAtOffset((startPos + 1 + Word.Length), LogicalDirection.Backward);
TextRange myRange= new TextRange(leftPointer, rightPointer);

Answer 1

This code adapted from a sample at MSDN will find words in from a specified position.

TextRange FindWordFromPosition(TextPointer position, string word)
{
    while (position != null)
    {
        if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
        {
            string textRun = position.GetTextInRun(LogicalDirection.Forward);

            // Find the starting index of any substring that matches "word".
            int indexInRun = textRun.IndexOf(word);
            if (indexInRun >= 0)
            {
                TextPointer start = position.GetPositionAtOffset(indexInRun);
                TextPointer end = start.GetPositionAtOffset(word.Length);
                return new TextRange(start, end);
            }
        }

        position = position.GetNextContextPosition(LogicalDirection.Forward);
    }

    // position will be null if "word" is not found.
    return null;
}

You can then use it like so:

string[] listOfWords = new string[] { "Word", "Text", "Etc", };
for (int j = 0; j < listOfWords.Length; j++)
{
    string Word = listOfWords[j].ToString();
    TextRange myRange = FindWordFromPosition(x_RichBox.Document.ContentStart, Word);
}