Can we use Regular Expressions for answer keywords or aliases?

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I need to make a specific answer show up in the search results if the search term is a 5 character alphanumeric string. I came up with this regex to match the string, but I'm not sure how to implement it. I added it as a keyword to my answer but it gets treated like a string.

Here's my regex:

/^[a-zA-Z0-9]{5}$/g