Your task here is to write two regular expressions, each of which matches the other one but does not match itself.
Both regular expressions should have this form:
/pattern/optional-flags
This is also the form in which they should be matched.
The shortest solution wins. The solution length is counted as the sum of characters in both regular expressions including slashes and flags.
Use a regex syntax standard of your choice, or specify a programming language, when it makes a difference.
Have fun!