[WikiEN-l] Tool announcement: Alternative names redirect

[Thomas Dalton]

> Technically, that's not necessary.
>
> You know that these things only change on save, so at that point  you
> look at the difference between the old aliases and the new and update
> the master set. Computationally, it's only a smidgen more expensive than
> our current approach. And given that we're such a read-heavy
> environment, unnoticeably so.

Not using regular expressions, you can't. Regexps are good for telling
if a string matches a pattern, they aren't good for producing a list
of all strings that match a pattern (which could be infinitely long if
you allow arbitrary patterns). A much simplified version of regexps
could be used, but I'm not sure if it's worth it.