how to return a string with findstr in windows with matching substring

I have a string in a file like,

async.AsyncTranslationThread - processPart: Finished Processing job number: J215577 partID: 151269

any many more.

I want to return only that line which has substring Finished Processing job number

I wrote a findstr command with regex like

findstr /R "^.*Finished\sProcessing\sjob\snumber.*$" filename

I am getting nothing in return, what would be the change in regex to get the string with substring in it?