[ElfMage]

You can do this:

PHP Code:

$message = preg_replace( 
       '#([^a-z\=\:]*)[\d]{7,11}([^\w\.]*)#si', 
        '\1u can\'t post numbers\2', 
        $message
    ); 


I used preg_replace because I am more familiar with that, but you can easily adapt the patterns to ereg_replace.

Basically what the code above is (supposed to be) doing is:

* Find any series of characters that are not characters, = or : (0 or more), and capture that into \1
* Followed by 7 to 11 digits (not captured)
* Followed by any non-character or ., and capture it into \2

And then replace that with the captured groups \1, your message, and \2.

I think that you mentioned in your last post differs from your original post, but you get the idea, you can change this to suit your needs.