Parallel version of find command on Linux

Question

On zsh shell, I put into my ~/.zshrc the following function :

ff () {
    parallel -j8 find {} -type f ::: $1/* | grep -i $2
}

The goal is to do a "parallel" version of classical find function.

But unfortunately, it doesn't seem to work : for example, in a directory containing R scripts, I am doing :

ff . '*.R'

But this command doesn't return anything. What is wrong with my function ff?

user_13261120 · Answer

By default grep uses basic regular expressions, so calling the function with another asterisk should work

ff . '**.R'

to ignore files like foo.r.bar

ff . '**.R$'

user_472495 · Answer

(Posted the solution on behalf of the question author to move it to the answer space):

Thanks to answer, the following works fine:

ff () { parallel -j8 "find {} -type f -name '$2'" ::: $1/*;}