It seems to me that it would be best to convert all the underscores to hyphens in one go, and then use php in a custom 404 to filter your URIs, perhaps:
with the appropriate redirect headers.
I'm sure it must be possible in .htaccess too - anyone care to make a stab at it?
PHP Code:
$pagename = $REQUEST_URI;
$pagename = ereg_replace("_", "-", $pagename);
I'm sure it must be possible in .htaccess too - anyone care to make a stab at it?
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