Emacs + projectile - how to find files by content?

Question

emacs

Is it possible to search by projectile project? There is a command that only searches by tags (projectile-find-tag). We need a similar one, but for arbitrary text.
Or what alternatives to projectile are there to solve this problem?
Ps Do not judge strictly, I switched from vim, I'm looking for solutions to some issues.

Answer 1

C-c p s g     Run grep on the files in the project.
M-- C-c p s g Run grep on projectile-grep-default-files in the project.
C-c p s a     Runs ack on the project. Requires the presence of ack-and-a-half.
C-c p s s     Runs ag on the project. Requires the presence of ag.el.

ack and ag alternatives for grep