[thelist] [ColdFusion] Regular Expression Questions

> so, i guess i'm looking for a subexpression that says "if there are any of
> the characters in the range of a-z, 0-9, and - (the only valid characters
> for a subdomain), then they must be followed by a dot, but the existence of
> the subdomain is optional".
>
this seems to work:
^https?:\/\/([a-z0-9-]+\.)?example\.com([^"]*)

does not match
http://badexample.com/foo

matches
http://example.com/foo
http://bob.example.com/foo