[regex] Regex match one of two words

I have an input that can have only 2 values apple or banana. What regular expression can I use to ensure that either of the two words was submitted?

This question is related to regex forms validation

The answer is

There are different regex engines but I think most of them will work with this:

apple|banana

Source: Stackoverflow.com

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[regex] Regex match one of two words

The answer is

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