How to delete lots of related keys at once

[K J]

>
>  Have you looked at the proposed solutions (i.e. tags and regex)?
>
>
> In general, having multiple copies of the same data seems like a bad idea.
>  When you cache the article,  you're avoiding the DB hit.  When you cache
> the page, you're memoizing a template render.  These are solving different
> problems.
>

Where can I find the proposed tags and regex solutions?
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