进行正则表达式以匹配所有不以时间戳开头的行

Question

Can anybody explain what the correct Java regex is to match all lines that don't start with timestamp [0-9]{4}-[0-9]{2}-[0-9]{2}?

I am trying to use ^(^[0-9]{4}-[0-9]{2}-[0-9]{2}) but it doesn't work.

Answer 1

Your ^(^[0-9]{4}-[0-9]{2}-[0-9]{2}) pattern matches a string starting with the pattern you defined (the ^ here just matches the start of a string).

In Go lang, the regex engine does not support lookarounds, and thus it is difficult to create a readable regex that would do the required job.

I suggest you remove all lines that match your pattern

(?m)\s*^[0-9]{4}-[0-9]{2}-[0-9]{2}.*

(see demo) and then split the result with line breaks to get the lines that did not match the pattern.