java regex 正則表示法

String A = "2009-01-01 10:10:10FFFFF";
A.matches("\\d{4}-\\d{2}-\\d{2}.*");
A.replaceAll("F", "");//替代全部
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public static void main(String[] args) {
String s = "asa09sadas09abdsa";
Pattern pattern = Pattern.compile("09");
Matcher matcher = pattern.matcher(s);
//不分大小寫
Pattern ptn = Pattern.compile("ab|ａｂ", Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
Matcher mch = ptn.matcher(s);
while(matcher.find()) {
System.out.println("比對符合"+matcher.group());
System.out.println("出現的位置"+matcher.start());
System.out.println("結束的位置"+matcher.end());
}
}