Regex Tester & Validator

Matches email attachment notification lines like 'Attached file: virus.exe', capturing a filename of exactly 5 characters followed by a dot and a 3-character extension at the end of the line. Commonly used in antivirus and spam filtering rules to flag suspicious attachments with short executable-style filenames (e.g., .exe, .bat, .vbs). The pattern anchors to end-of-line to ensure the extension is the final content.