#1642 Change one url parameter value with redirect

[vertebrac]

Hi guys!!
I'v been working on the last few days, trying to change just one value of a parameter for a given domain.

Ej: Whenever a request like this is made:

http://testsite.com/?toChange=foo&notToChange=bar1&notToChange=bar2

i'll need to change the "toChange" parameter to ej: bar0, so after the redirect, i need to get something like this:

http://testsite.com/?toChange=bar0&notToChange=bar1&notToChange=bar2

I almost get it done with this:

{+redirect{s@^http://testsite.com/\?toChange=[^&](.)@http://testsite.com/?toChange=bar0$1@}}
testsite.com

But the problem with this last statement, is that erases everything behind the first parameter, so i end with something like this:

http://testsite.com/?toChange=bar0

instead of:
http://testsite.com/?toChange=bar0&notToChange=bar1&notToChange=bar2

Can you give me a clue about what i’m doing wrong?

Thanks!!

[Fabian Keil]

One problem is that the URL pattern will match the redirected URL, so the client will get redirected again (and again and again ...).

Another problem is that "^&" matches two characters of which the first one can't be an ampersand (&). This is probably not what you meant.

You could try something like:

{+redirect{s@toChange=[^&]+@toChange=bar0@}}
example.com/.*toChange=(?!bar0)

[vertebrac]

Works like a charm!
Thanks so much! Fabian!!

[Fabian Keil]

You're welcome. Thanks for the confirmation.