Hi Loops, Thank you for your help. Tell me if I am wrong concerning the interpretation of your expression: qr(10-KQA-Z0-9*(?!/))i; 1. You are saying find a string (QR) 2. which begins with 10-K or 10-Q KQ 3. followed by any letter from A-Z (A-Z] 4. followed by any number 0-9 [0-9} 5. excluding any string which terminates with slash *(?!/))i Is that right? If so, how would the expression change if I were looking for upper case letters only? Your insight is invaluable, and I am grateful! Rick