sanitize()
|  Sanitize (rename attachment filenames) an email.
|  
|  This scanners is a realscanner, which can be used to sanitize
|  email. It means all attachments are renamed to safe names.
|  For example "filename.exe" will be renamed to "filename-exe".
|  
|  WARNING! This scanner is in BETA stage! Id don't conform to RFC 2183!
|  
|  Usage: sanitize(insert='-',extensions='[a-z0-9]{3}')
|  
|  Where: insert is a string, which can be inserted for sanitized attachments
|         extensions is an regular expressios to find