Given mixed accented and normal characters in string not working in java when searching

String text = "Cámélan discovered ônte red aleŕt \n Como se extingue la deuda";

If i give the input Ca, it should highlight from the given string Cá but it's not highlighting.

Below is what I tried.

 Pattern mPattern; 
  String filterTerm; //this is the input which I give from input filter. Say for eg: Ca
   String regex = createFilterRegex(filterTerm);
        mPattern = Pattern.compile(regex);

 private String createFilterRegex(String filterTerm) {
        filterTerm = Normalizer.normalize(filterTerm, Normalizer.Form.NFD);
       filterTerm = filterTerm.replaceAll("[\\p{InCombiningDiacriticalMarks}]", "");
        return filterTerm;
    }

public Pattern getPattern() {
        return mPattern;
    }

In another class,

private SpannableStringBuilder createHighlightedString(String nodeText, int highlightColor) { //nodeText is the entire list displaying. 
        SpannableStringBuilder returnValue = new SpannableStringBuilder(nodeText);
        String lowercaseNodeText = nodeText;
        Matcher matcher = mFilter.getPattern().matcher((createFilterRegex(lowercaseNodeText)));
        while (matcher.find()) {
            returnValue.setSpan(new ForegroundColorSpan(highlightColor), matcher.start(0),
                    matcher.end(0), Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
        }

        return returnValue;
    }

viewHolder.mTextView.setText(createHighlightedString((node.getText()), mHighlightColor));

But what i am getting output as,

If i type single alphabet o alone, it's highlighting but if i pass more than two alphabets say for eg: Ca, it's not highlighting and displaying. I couldn't figure out what mistake i am doing.

But if you look whatsapp. it has been achieved.

I typed Co, it's recognizing and highlighting accented characters in sentence.

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