What is the best way to correct parse log file?-CodePudding

I want to parse java log. I need to get only Error log with tracer.

For example:

2022-06-21 19:19:56,665 ERROR [scheduler-3] o.s.s.s.TaskUtils$LoggingErrorHandler - Unexpected error occurred in scheduled task 
java.lang.NullPointerException: null
    at ...
    at ...
    ...
2022-06-21 19:19:56,666 DEBUG

I need take all until new log line with data. It is:

2022-06-21 19:19:56,665 ERROR [scheduler-3] o.s.s.s.TaskUtils$LoggingErrorHandler - Unexpected error occurred in scheduled task 
java.lang.NullPointerException: null
        at ...
        at ...
        ...

What is the best way to make regular expression for this task with repeating symbols? In my way there are something like that . \n\t If I not use repeat it seems ugly, like that REG_EXP_2 = r'\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3}\sERROR. \n. \n\t. \n\t. ' So I need to find all log strings with model . \n\t until I will find new data line.

I triet to use model with repeating symbols, but it parses only last finding string.

Thank you.

CodePudding user response：

To match ERROR amd all the following lines that do not start with a date:

^\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3}\sERROR\b.*(?:\n(?!\d{4}-\d{2}-\d{2}\s).*)*

Regex demo