Groovy regex filemail

A groovy regex file mail!

Here's a regex pattern that matches a file mail (a file attached to an email):

^From:.*\r\nTo:.*\r\nSubject:.*\r\n\r\n(?<file_name>.*\.([a-zA-Z0-9]+))\r\n(?<file_data>.*)

Let me break it down:

• ^From:.*\r\nTo:.*\r\nSubject:.*\r\n\r\n: This matches the email headers (From, To, Subject) followed by a blank line (\r\n\r\n).
• (?<file_name>.*\.([a-zA-Z0-9]+)): This is a capture group that matches the file name. The .* matches any characters (including the dot .), and the ([a-zA-Z0-9]+) matches one or more alphanumeric characters (the file extension). The (?<file_name> syntax names this group as "file_name".
• (?<file_data>.*)): This is another capture group that matches the file data. The .* matches any characters (including the file contents). The (?<file_data> syntax names this group as "file_data".

Here's an example of how this regex pattern would match a file mail:

From: [email protected]
To: [email protected]
Subject: File attachment

file.txt
Content-Type: text/plain; charset=UTF-8
Content-Disposition: attachment; filename="file.txt"

This is the file contents...

In this example, the regex pattern would match the following:

• file_name: "file.txt"
• file_data: "This is the file contents..."

Note that this regex pattern assumes that the file mail has a simple format with a single file attachment. If your file mails have a more complex format (e.g., multiple attachments, different content types), you may need to modify the regex pattern accordingly.