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> >    address = gsub(gsub(address, "@", " at "), "%.", " dot ")
> > would be sufficient.

> Not really. The spammer's bots can easily substitute those back
> again to the real email address. Spammers can use regexps as well
> as we can.

That may be true, but i bet (as long as email address obfuscation isn't done
by the majority of web users) that 95% of mail harvesters don't bother. It's
not that they would only have to add one regexp to their search, there are
lots of schemes to obfuscate an email address - and then it isn't as easy
any more to detect if something is an email address or not.