Dutch end of email is not detected correctly #41

This part of the gem: if text =~ /^(?!On.*On\s.+?wrote:)(On\s(.+?)wrote:)$/nm works correctly for non-Dutch emails, but this is not correctly parsed as the end of the email:

Op zondag 31 mei 2015 heeft Name <hello@fakeapp.nl> het volgende geschreven:

It would be awesome if this could be added!