Regex for an exception within an exception

Question

This question here helped me how to do an exception: Regex with exception of particular words

Basically, rx = /^(?!apple$|orange$|banana$)/ would match everything but apple, orange and banana. But now I need to know how to do an exception for an exception.

rx = /^(?!.*$)/

I believe this would ignore everything, but what should I add to make it match nothing BUT some pre-defined words, like banana and apple?

er... are you just trying to match banana and apple? /^(apple|banana)$/ — Christophe
– Christophe, Commented Nov 8, 2012 at 19:09
Isn't an exception to an exception just a normal regex? So, to match apple and/or banana (but nothing else), would something simple like /apple|banana/work? — Upgradingdave
– Upgradingdave, Commented Nov 8, 2012 at 19:11

Matt Ball · Accepted Answer · 2012-11-08 19:09:58Z

1

The opposite of the opposite of x is simply x:

/^(apple|orange|banana)$/

The above regex only accepts input which exactly matches apple, orange, or banana.

answered Nov 8, 2012 at 19:09

Matt Ball

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