linux - Take information from a file with grep

Question

I need to edit a huge file and only need to keep with the lines that start with [INFO].

I already tried

grep "'[^INFO]*'"

and

grep-i '\[^INFO]*'

among other and none of them worked.

Could you help me with this?

标签： linuxgrep

Answer 1

正则表达式"'[^INFO]*'"匹配所有带有单引号且没有I, N,F或O字符的行，请参见https://regex101.com/r/dDX5PQ/1。情况就是这样，因为[和]是特殊字符，表示一系列字符。以^它开头时，表示不匹配的字符范围。

您想要的正则表达式是grep "^\[INFO\].*"，它将匹配以[INFO]参见https://regex101.com/r/bIEoBx/2开头的所有行。