rspec with grep to run selected specs

rspecgrep.sh

function rspecgrep()
{
  SPK_FILES=`find spec -type f -name "*_spec.rb" | grep $1`
  echo $SPK_FILES
  time rspec $SPK_FILES  --format documentation
}

This code helped me a lot thanks for the helper.
However, it looks like it's deprecated because it fails whenever you try to execute it. The main reason is that $SPK_FILLES seems to be treated as a string by rspec.
Here is my patch to make it work properly.

#!/bin/(shell of your choice)
function rspecgrep()
{
  SPK_FILES=`find spec -type f -name "*_spec.rb" | grep $1`
  echo $(echo "${SPK_FILES}" | sed -e 's/\n/\\n/' -e 's/ /\ /')
  time rspec --format documentation -- $(echo "${SPK_FILES}" | sed -e 's/\n/\\n/' -e 's/ /\ /')
}