bug#24067: Bug Report : How to grep and treat meta character as normal character?

[Paul Eggert]

It appears that you have an alias or other implementation of 'grep', and 
that this is not a bug in GNU 'grep' per se. If you are using a shell 
like 'bash', try these two shell commands to see which 'grep' you are 
actually using.

type grep
which grep