Regex that only matches itself

There are some pretty cool challenges out there involving regex (Self-matching regex, Regex validating regex) This may well be impossible, but is there a regex that will ONLY match itself? NOTE, delimiters must be included: for example /thing/ must match /thing/ and not thing. The only match possible for your expression must be the expression itself. Many languages allow the implementation of a st

[mrkn]

自分自身だけにマッチする正規表現