编写Regex以提取Java中的信息

Question

我有两条短信。

1) v1.0 - 80 s200 + 2013-10-17T05:59:59-0700 1TZY6R5HERP7SJRRYDYV 69.71.202.109 7802 41587 495307 30595 HTTP/1.1 POST /gp/ppd

2) access-1080.2013-10-17-05.us-online-cpp-portlet-live-1d-i-752c3b12.us-east-1.phnew.com.gz

我需要从第一个Regex获得这些数据:- 1TZY6R5HERP7SJRRYDYV .Lets调用这个accessId。它总是由20个字符组成，由0-9和upperCase字母表A中的数字组合而成。

我试着使用[A-Z0-9]{20}却没有运气。

Pattern p = Pattern.compile([A-Z0-9]{20});  
Matcher m = p.matcher(myString);

此外，我正在寻找一个与模式匹配的java API，如果它匹配，则给出该模式。

从第二次开始我就需要us-online-cpp-portlet-live-1d-i-752c3b12.us-east-1.phnew.com。我很难破解这件事。

任何帮助都是有用的。

Answer 1

您的代码有一些问题--例如，在Pattern初始化中缺少双引号。

下面是你要找的东西的一个例子：

// text for 1st pattern
String text1 = "v1.0 - 80 s200 + 2013-10-17T05:59:59-0700 1TZY6R5HERP7SJRRYDYV 69.71.202.109 7802 41587 495307 30595 HTTP/1.1 POST /gp/ppd";
// text for 2nd pattern
String text2 = "access-1080.2013-10-17-05.us-online-cpp-portlet-live-1d-i-752c3b12.us-east-1.phnew.com.gz";
// 1st pattern - note that the "word" boundary separators are useless here, 
// but they might come in handy if you had alphanumeric Strings longer than 20 characters
Pattern accessIdPattern = Pattern.compile("\\b[A-Z0-9]{20}\\b");
Matcher m = accessIdPattern.matcher(text1);
while (m.find()) {
    System.out.println(m.group());
}
// this is trickier. I assume for your 2nd pattern you want something delimited on the
// left by a dot and starting with 2 lowercase characters, followed by a hyphen, 
// followed by a number of alnums, followed by ".com"
Pattern otherThingie = Pattern.compile("(?<=\\.)[a-z]{2}-[a-z0-9\\-.]+\\.com");
m = otherThingie.matcher(text2);
while (m.find()) {
    System.out.println(m.group());
}

输出：

1TZY6R5HERP7SJRRYDYV
us-online-cpp-portlet-live-1d-i-752c3b12.us-east-1.phnew.com

Answer 2

您需要调用Matcher#find()，然后调用Matcher#group()，以获得匹配的结果：

Pattern p = Pattern.compile("[A-Z0-9]{20}");
Matcher m = p.matcher(myString);
String accessId = null;
if (m.find())
   accessId = m.group();