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copied!<p>You are likely going to have write your own <code>Filter</code> and attach it via a <code>TextWatcher</code>. This response has an example of regex in an <code>AutoCompleteTextView</code>: <a href="https://stackoverflow.com/questions/5691356/android-autocompletetextview-with-regular-expression">Android AutoCompleteTextView with Regular Expression?</a> and here is another regex/java example: <a href="https://stackoverflow.com/questions/2469231/how-can-i-perform-a-partial-match-with-java-util-regex">How can I perform a partial match with java.util.regex.*?</a></p> <p>EDIT: You will need to extend ArrayAdapter in order to override getFilter() and return your custom filter.</p> <p>So you are going to have something like this:</p> <pre><code>autoCompleteTextView.setAdapter(arrayAdapter); autoCompleteTextView.addTextChangedListener(new TextWatcher() { public void onTextChanged(CharSequence s, int start, int before, int count) { arrayAdapter.getFilter().filter(s); } }); public class RegexFilter extends Filter{ ArrayAdapter<String> mAdapter; public RegexFilter(ArrayAdapter<String> adapter) { mAdapter = adapter; } ... @Override protected FilterResults performFiltering(CharSequence constraint) { Pattern p = Pattern.compile(constraint); Matcher m = p.matcher(""); List listOfMatches = new ArrayList<String>(); for (String curMonth : months) { m.reset(curMonth); if (m.matches || m.hitEnd()) { listOfMatches.add(curMonth); } } FilterResults results = new FilterResults(); results.values = listOfMatches; results.count = listOfMatches.size(); return results; } @Override protected void publishResults(CharSequence constraint, FilterResults results) { mAdapter.addAll(results.values); mAdapter.notifyDataSetChanged(); } } public class PartialArrayAdapter extends ArrayAdapter<String> { ... RegexFilter mFilter; @Override public TimedSuggestionFilter getFilter() { if(null == mFilter) mFilter = new RegexFilter(this); return mFilter; } </code></pre>

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