Parse year from basename

[PlasticArmyGuy]

I have multiple scanned photos with a year in the filename.  For example, a file may be named Tom_graduation_1952_photo.jpg or Mustang_Sally_1968.jpg.  The year can appear anywhere within the name.

I have been trying without success to parse the four digits and insert that into the subject tag. 

Can this be done and if so, how?

Appreciate any assistance.

[StarGeek]

Try
exiftool "-Subject+<${Filename;m/(\d{4})/;$_=$1}" /path/to/files/

This command will grab four consecutive numbers and add that to the XMP-dc:Subject, which is used to hold keywords.

[PlasticArmyGuy]

Thank you.  That works well.

Would it be possible to modify this to skip files that do not have a date in the name?

[StarGeek]

Try
exiftool -if "$filename=~m/(\d{4})/" "-Subject+<${Filename;m/(\d{4})/;$_=$1}" /path/to/files/

[PlasticArmyGuy]

Thanks again.  Works great!