How to make variable infront of pipeline in bash?

I would like to save output of first command as variable in front of pipeline and send them to the pipe, too.

For example: find -type d | grep -E '^\./y'. And in my variable going to be output of find -type d.

Thanks for help

EDIT Maybe I can solve this problem another way, but I am standing in front of another problem. How to call my own function with parameter from pipeline?

EX: find -type d | MyFunction

Solution

RE:

EDIT Maybe I can solve this problem another way, but I am standing in front of another problem. How to call my own function with parameter from pipeline?

EX: find -type d | MyFunction

The following all work:

$ cat ./blah.sh
#!/bin/bash
function blah {
        while read i; do
                echo $i
        done
}    
find ~/opt -type d | blah
blah <<< $(find ~/opt -type d)
blah < <(find ~/opt -type d)

$ ./blah.sh
/home/me/opt
/home/me/opt/bin
/home/me/opt /home/me/opt/bin
/home/me/opt
/home/me/opt/bin

So I'd imagine if find -type d | MyFunction doesn't work, then the function is probably not looking for input on stdin.