Simple regex problem - mod_rewrite - please help.

habbardone

Hi ,

My simple redirect is working EXCEPT if there is a period in the
string.

This is what I have:

RewriteCond %{HTTP_HOST} ^([^.]+).example.net [NC]
RewriteCond %{HTTP_HOST} !^www.example.net [NC]

RewriteRule ^.*$ http://example.net/disp_page.php?a=%1 [NC,QSA,L]

So this works fine with :

potatoes.example.net

that goes to example.net/disp_page.php?a=potatoes

and the page displays

BUT if I have

recipes.potatoes.example.net

then it doesn't work

It should go to : example.net/disp_page.php?a=recipes.potatoes

Which would work fine.

Does any one know how I should adjust my code above so that it takes everything up to the ".example.net"?

Thanks.

bradgrafelman

This:

[^.]+

is saying "any character except a period repeated 1 or more times." And your question is why won't that pattern match periods? 😉

If you don't care what characters match that pattern, then don't use a negated character class - simply use '.' to represent any character.

sneakyimp

You can replace the bit bradgrafelman pointed out with .+

RewriteCond &#37;{HTTP_HOST} ^(.+).example.net [NC]
RewriteCond %{HTTP_HOST} !^www.example.net [NC]

RewriteRule ^.*$ http://example.net/disp_page.php?a=%1 [NC,QSA,L]

habbardone

So it should be like this:

RewriteCond %{HTTP_HOST} ^(.+).simpg.net [NC]
RewriteCond %{HTTP_HOST} !^www.simpg.net [NC]

RewriteRule ^.*$ http://simpg.net/disp_page.php?a=%1 [NC,QSA,L]

Or is this saying that there must be many periods ?

bradgrafelman

Also note that this:

!^www.example.net

should probably instead be this:

!=www.example.net

since you want a literal comparison (and don't want regular expression syntax to be used; otherwise you've got some unescaped periods and probably a missing '$' at the end).

EDIT:

habbardone;10998361 wrote:
Or is this saying that there must be many periods ?

The period (when not inside of a character class) is used as a wildcard to denote "any character."

sneakyimp

in a regular expression, a period means "any character".

habbardone

Thanks very much for your help 🙂

Also note that this:
Code:

!^{www.example.net}

should probably instead be this:
Code:

!=www.example.net

since you want a literal comparison (and don't want regular expression syntax to be used; otherwise you've got some unescaped periods and probably a missing '$' at the end).

If that is the case ... isn't there a missing $ in the first line :

RewriteCond %{HTTP_HOST} ^{(.+).example.net} [NC]

Sorry - just trying to get it correct.

So far I have this:

RewriteCond %{HTTP_HOST} ^(.+).example.net [NC]
RewriteCond %{HTTP_HOST} !=www.example.net [NC]

RewriteRule ^.*$ http://example.net/disp_page.php?a=%1 [NC,QSA,L]

Thanks