Re: [Libevent-users] libevhtp regex question

[Bruce Armstrong <bruce@xxxxxxxxxxxxxxxxxxxxx>]

It could be that the first regex is matching before the third.  Perhaps ordering the expressions from most specific to least would allow it to match.  Also consider a terminating $ if there isn't supposed to be anything after in the url.  

--Bruce

On Sat, Nov 9, 2013 at 2:30 PM, Tom Pusateri <pusateri@xxxxxxxxx> wrote:

I know that libevhtp isn't officially part of libevent yet but maybe someone on this list will have a good solution.

Say I want to match the following URIs:
/customers/
/customers/1/
/customers/1/transactions/
/customers/1/transactions/13/

If I add matching expressions such as:

evhtp_set_cb(htp, "/customers/", customers_cb, "customers");
evhtp_set_regex_cb(htp, "^/customers/([0-9]+)/", customer_cb, NULL);
evhtp_set_regex_cb(htp, "^/customers/([0-9]+)/transactions/", transactions_for_customer_cb, NULL);
evhtp_set_regex_cb(htp, "^/customers/([0-9]+)/transactions/([0-9]+)/", transaction_for_customer_cb, NULL);

I can match the first _expression_ but not get to the second:

start = '1', end = '/transactions/13/

What is the best way to get to the 2nd _expression_ '13'?

I can re-parse end but then I have multiple places where the code contains the same _expression_.

If you're familiar with Python regular expressions, there is m.group(1), m.group(2), etc to get each match.

Thanks,
Tom