无法在Java中匹配正则表达式

Question

我在Java中实现了下面的测试正则表达式,但我看不到任何匹配.我是正则表达式的新手,但它看起来应该找到匹配.我在这里做错了什么？

 public static void main(String[] args) {
    // TODO Auto-generated method stub
    String process= "SSHD is running: PID:12506, Wrapper:STARTED, Java:STOPPPED";
    Pattern patternFileToScan = Pattern.compile("SSHD is running: PID:[d]{1,5}, Wrapper:STARTED, Java:STARTED");
      Matcher matcherFileToScan = patternFileToScan.matcher(process);
      System.out.println("TEST");
      if(matcherFileToScan.matches()) {
          System.out.println(matcherFileToScan.group());
      }

}

Answer 1

更改PID:[d]{1,5}到PID:\\d{1,5}.

[d]{1,5}将尝试匹配字符d而不是数字.