regex - LogMX 正则表达式解析器的问题

Question

我们正在使用 LogMX 日志查看器来监控我们的应用程序日志，使用正则表达式解析器。

每次日志消息包含“-”字符时，LogMX 都不会按预期解析日志事件。

例如，以下日志事件：

[ERROR] | com.nsoft.gmonitor.Controller - File Loader - Error while loading file "C:\GMonitor\prefs.properties - Copy"

被解析为：

• 发射器： com.nsoft.gmonitor.Controller - File Loader

• 线： Error while loading file "C:\GMonitor\prefs.properties

• 信息：- Copy"

代替：

• 发射器：com.nsoft.gmonitor.Controller

• 线：File Loader

• 信息：Error while loading file "C:\GMonitor\prefs.properties- Copy"

我们正在使用以下正则表达式：

\[(.*)\] \| (.*) - (.*) - (.*)

谢谢您的帮助。

Answer 1

You should use this regexp instead:

\[(.*)\] \| (.*?) - (.*?) - (.*)

I just added a ? character after .* for 'Emitter' and 'Thread' fields/groups. This is a common regular-expression issue (not specific to LogMX):

• .* is called a greedy quantifier: it means that it will try to match the maximum number of characters

• .*? is called a reluctant quantifier: it means that it will try to match the minimum number of characters

You can read more about this in JDK API (search for 'greedy') or LogMX docs.

PS : if you don't want to use regular expressions to parse your logs in LogMX, you could use its "Log4j/Logback pattern Parsers" instead: the pattern [%p] | %c - %t - %m will match your need, and is reluctant by default for all fields/groups by default.

Answer 2

那是因为你的正则表达式是贪婪的。尝试添加?到您的组以避免正则表达式贪婪。

看看这个：

\[.*\] .? (.*?) - (.*?) - (.*)

调试演示

在这里，您可以看到存储在组中的正确值：