Email Filtering Regex Problem

Hello, I want emails containing a PDF or JPG attachment from certain email addresses to be automatically moved to a folder. I'm using the cpanel Email filters. It works for all email addresses, except one, and I can't think why. The filter is (simplified): FROM matches regex: test\.com|@foo\.com|@bar\.com AND Body matches regex: name=[\s\S]*(\.jpg|\.pdf) (I use "[\s\S]*" because ".*" doesn't work if there are linebreaks in the filename, which can happen sometimes.) ACTIONS: Deliver to folder ... STOP PROCESSING RULES So, for an example, an email with: From: "Test Name" ...and the body containing: ... Content-Type: application/octet-stream; name=test.pdf Content-Transfer-Encoding: base64 ... would be matched...which it is...in all cases except one... in this case it's always emails from "@foo.com" that are never matched. The pdfs are never huge...however for the one email address that doesn't work, sometimes the email is usually around 400kb... could the size of the body mean that the regex match fails for larger email? Many thanks for any insights.