Find a number in a string of characters

Hello,

I need a bit of guidance and help. I have a supplier statement where an item number is for eg. 12345 and it shows there was 2 items purchased. Our system logs item as Q12345XVTE and gives quantity as well. What I need is a formula to put on supplier statement that will find 12345 within our records and return our logged number of items to see if it matches supplier statement. Thank you.