Question

在Java中，使用以下正则表达式

To: a@b\.com.*Subject: Please verify your email address

以某种方式在本文中找不到匹配项：

Dez 21, 2012 10:29:58 AM com.google.appengine.api.datastore.dev.LocalDatastoreService init
INFO: Local Datastore initialized: 
    Type: High Replication
    Storage: In-memory
Dez 21, 2012 10:29:58 AM com.google.appengine.api.mail.dev.LocalMailService log
INFO: MailService.send
Dez 21, 2012 10:29:58 AM com.google.appengine.api.mail.dev.LocalMailService log
INFO:   From: 
Dez 21, 2012 10:29:58 AM com.google.appengine.api.mail.dev.LocalMailService log
INFO:   To: a@b.com
Dez 21, 2012 10:29:58 AM com.google.appengine.api.mail.dev.LocalMailService log
INFO:   Subject: Please verify your email address
Dez 21, 2012 10:29:58 AM com.google.appengine.api.mail.dev.LocalMailService log
INFO:   Body:
Dez 21, 2012 10:29:58 AM com.google.appengine.api.mail.dev.LocalMailService log
INFO:     Content-type: text/plain
Dez 21, 2012 10:29:58 AM com.google.appengine.api.mail.dev.LocalMailService log
INFO:     Data length: 4

我的Java代码如下所示：

    Matcher matcher = Pattern.compile(regex, Pattern.MULTILINE).matcher(input);
    if (matcher.find()) {
        ...
    }

这有点奇怪，因为当我使用此工具在线测试时，该模式似乎有效：http://regexpal.com

因此，Java必须以不同的方式解释模式。有没有办法获取Matcher的错误消息？

更新它应该找到：

To: a@b.com
Dez 21, 2012 10:29:58 AM com.google.appengine.api.mail.dev.LocalMailService log
INFO:   Subject: Please verify your email address

Answer 1

您需要使用Pattern.DOTALL代替Pattern.MULTILINE。

DOTALL使.匹配换行符。（这是你想要的）

MULTILINE使^和$按行进行。

Java多行正则表达式调试

1 个答案: