I also reached out to them on Twitter but they directed me to this form. I followed up with them on Twitter with what happened in this screenshot but they are now ignoring me.

  • nybble41@programming.devEnglish
    1·
    11 months ago

    The full email address syntax described in the RFC cannot be precisely matched with a mere regular expression due to the support for nested comments. The need to track arbitrarily deep nesting state makes it a non-regular language.

    If you remove the comments first the remainder can be parsed with a very complex regex, but it will be about a kilobyte long.