Bash find & sed to trim trailing spaces & convert indents

spacen.sh

#!/bin/bash

# search for js, php & css files from current dir and below
# trim trailing spaces and tabs
# replace groups of 4 spaces to tab
# TODO: replace indents only, ie - only spaces at start of lines
# Problem: indentation tabs number must exact match to number of full spaces' groups

find ./ -type f -regex ".*\.\(js\|php\|css\)$" -exec sed -i -r 's/[ \g]+$//;s/^ {4}/\t/g' {} \;