Textarea - create String that acts like a single character

Hi guys,
I am trying to create a string in a textarea that acts like a single character. By this, I mean that the user cannot edit the contents of that section of text. Here's an example:
Textarea text:
[Number of Iterations] * 35 / 200
I want the [Number of Iterations] to be read-only. In addition, if the user tries to delete the beginning or end of [Number of Iterations], the whole thing is deleted. If possible, I would like cursor operations to treat it like a single character as well (i.e. to go from |[Number of Iterations] to [Number of Iterations]| takes a single right button press).
Some commercial applications like Microsoft Word do this with Automatically created text in documents (like page numbers and date stamps) and I was wondering if I could do the same thing using a Textarea.
Any help would be greatly appreciated.
Thanks in advance,
Steve

A JTextPane allows you to add components to the text pane. So you might be able to create a JLabel with your desired text and insert the label into the text pane.

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