#!/bin/bash
#
# Extract the original filename of renamed .R3D file. This is useful for reconstructing
# R3D files restored from a data-recovery operation from an HFS+ drive.
#
# note: the “-m 1” argument tells grep to stop after the first returned match.
# The pipe to "cut” is a dumb way to trim the leading “V” character on the returned filename

strings "FILE.R3D" | grep -m 1 -E "^.*[A-Z][0-9]{3}_[A-Z][0-9]{3}_[0-9]{4}[A-Z0-9]{2}_[0-9]{3}.R3D" | cut -c2-