grepping a string from a large code base

Hi vim community,
I need to constantly perform a grepping of a string(eg, sth in logs)
from a large code base, now I use grep on the command line to do this.
I just started using ctags but it can not do the grepping of arbitrary
string for me.

could any vim users point me to a popular tool that I can use to
improve my efficiency, I use only vim to browse and write code so I
hope this is not off topic here.

Thank you,
Jim

--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php