请问这个正则表达式是什么意思?
是获得一个类似英语每日一词的内容
Pattern pattern = Pattern.compile(SimpleWikiHelper.WORD_OF_DAY_REGEX);
Matcher matcher = pattern.matcher(pageContent);
if (matcher.find()) {
//建立更新的更新服务器和Widget的内容
// Build an update that holds the updated widget contents
updateViews = new RemoteViews(context.getPackageName(), R.layout.widget_word);
String wordTitle = matcher.group(1);
updateViews.setTextViewText(R.id.word_title, wordTitle);
updateViews.setTextViewText(R.id.word_type, matcher.group(2));
updateViews.setTextViewText(R.id.definition, matcher.group(3).trim());
matcher.group(1)
matcher.group(2);
matcher.group(3);分别指的是什么