What tool to use for this regex - regex

Question

I am using a combination of Automator, Bash, and Exiftool to take filenames like this: 0615090217.jpg and change the date created to 2009:06:15 02:17:00.
Most of the pieces of the puzzle are working, I even have working regex, I just don't know how to apply it using bash or some combination of other tools. I've been seeing sed suggested, but I don't know how to apply it.
The following regex works here, but I don't know how to apply it in my setup:
Expression: /(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})(.*)\.[^.]+$/g
Substitution: \n20$3:$1:$2 $4:$5:00\n\t
Text: 0615090217.jpg
The shell script in my Automator workflow looks like this:
for f in "$#"
do
FILENAME=$(basename "$f")
MYDATE='2010:07:09 12:22:00'
/usr/local/bin/exiftool -overwrite_original_in_place -preserve "-AllDates=${MYDATE}" "$f"
done
I want to replace MYDATE with a date extracted from the filename, using my regex or some other method. I feel like I'm close, it's just connecting the final dots.

Answer 1

If you're using OSX, FreeBSD, NetBSD, etc, then the date command lets you easily convert from one format to another:
#!/usr/bin/env bash
for f in "$#"
do
FILENAME=$(basename "$f")
MYDATE=$(date -j -f '%m%d%y%H%M.jpg' "$FILENAME" '+%Y-%m-%d %H:%M:00')
/usr/local/bin/exiftool \
-overwrite_original_in_place \
-preserve "-AllDates=${MYDATE}" \
"$f"
done
You can also achieve this by ripping apart the filename using bash's "Parameter Expansion", but that takes more typing.

Answer 2

Exiftool can do this by itself. There's no need for scripts, since that would just slow the whole process down because it would call exiftool for each file.
Try something like:
/usr/local/bin/exiftool -overwrite_original_in_place -preserve '-AllDates<${Filename;s/(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})(.*)\.[^.]+$/20$3:$1:$2 $4:$5:00/}' DIR
I just lifted your regex and stuck it in, so test it out first, of course. My quick test here worked correctly, output below.
c:\>exiftool -g1 -alldates X:\!temp\0615090217.jpg
---- IFD0 ----
Modify Date : 2012:08:30 22:25:33
---- ExifIFD ----
Date/Time Original : 2013:18:08 19:04:15
Create Date : 2012:08:30 22:25:33
c:\>exiftool "-AllDates<${Filename;s/(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})(.*)\.[^.]+$/20$3:$1:$2 $4:$5:00/}" X:\!temp\0615090217.jpg
1 image files updated
c:\>exiftool -g1 -alldates X:\!temp\0615090217.jpg
---- IFD0 ----
Modify Date : 2009:06:15 02:17:00
---- ExifIFD ----
Date/Time Original : 2009:06:15 02:17:00
Create Date : 2009:06:15 02:17:00