Remove span when text inside the span is changed in Android

Let´s say I make a comment like this: Hi Andrea check this out..... In that comment I want to highlight Andrea, but whenever I change the value of Andrea or when I delete one character of the word the span changes, the problem is that I´m using spannableString.setSpan(new StyleSpan(Typeface.BOLD), indexOfAt, highlightName.length() + indexOfAt, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE), which Spanned.SPAN_EXCLUSIVE_EXCLUSIVE accepts words in the middle and deletion of words, how can I remove the span when the user changes the word or delete a character of the word?