if url contains "_" send to 404?

[dj-kenpo]

is it possible posible via a header to detect if the url (or $_get["title"] in my case) has underscores and if so send to the 404 page?

 

my old urls had underscore, the new ones use more standard dashes, and the bots are all still roaming the old pages (which don't work and have errors) so I'd like to tell them to not go there I guess via 404..

[Danltn]

RewriteEngine On

RewriteBase /

RewriteRule _ /404document.php [QSA,L]

ErrorDocument 404 /404document.php

[per1os]

is it possible posible via a header to detect if the url (or $_get["title"] in my case) has underscores and if so send to the 404 page?

 

my old urls had underscore, the new ones use more standard dashes, and the bots are all still roaming the old pages (which don't work and have errors) so I'd like to tell them to not go there I guess via 404..

 

Sure, but a better thing to do would 301 the bots to the new page.