I need a regexp that will convert high-bit characters (eg. > \0377 ?) to the appropriate character entity (eg. &x123;).

No, you do not need a regexp that will do that. There's a very nice module that does HTML entities: HTML::Entities.

When I'm in a hurry, I often use s/(\W)/'&#' . ord($1) . ';'/g for dumping data, because it's so easy to convert it back to the original, and encoding printable \W characters doesn't hurt.

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