How to change a predefined group of text in JTextArea

I am adding pre defined words to a JTextArea. How can I ensure that if I want to change the text in the text area that the entire word is changed. I would like to have the capability of keeping the text in a string.
Thank you in advance.

Do your required process on the model level, i.e. text level or document level, and add the result using setDocument() or setText() of the JTextArea.

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