[SR-Users] htable shtcn expressions

Brooks Bridges bbridges at call48.com
Fri Oct 29 08:28:44 CEST 2021


That was my understanding of how it should work as well, however in my testing it does not appear to be working that way.

e.g. if there is a key of "+18884441111” in my dataset and I do $shtcn(htablename=>~%8884441111) I get a count of 0.

As far as regex, I am trying to avoid that as I was told many years ago that regex is inherently slow when compared to other operations in Kamailio.  I was told this by someone I trust as an authority, and since this is a quite high volume system (greater than 1500 requests per second at peak load), every millisecond matters.

________________________________
From: ‪M S‬ <shaheryarkh at gmail.com>
Sent: Thursday, October 28, 2021 5:16 PM
To: Brooks Bridges; Kamailio (SER) - Users Mailing List
Subject: Re:[SR-Users] htable shtcn expressions

Per my understanding, the left prefix match means the name "starts with" given prefix, while the right prefix match means the name "ends with" given prefix.

$sht(a=>aac) = 1;
$sht(a=>abc) = 1;
$sht(a=>acc) = 1;
$sht(a=>adc) = 1;

...

// both will produce same output
xlog("$shtcn(a=>a.*)");
xlog("$shtcn(a=>%~a)");

// both will produce same output
xlog("$shtcn(a=>.*c)");
xlog("$shtcn(a=>~%c)");

I usually use regex whenever possible and avoid these fancy derivatives to keep things simple and easy to understand in kamailio config.

Hope this helps.

--
Muhammad Shahzad Shafi
Tel: +49 176 99 83 10 85


Sent from my Huawei P40 5G phone


-------- Original message --------
From: Brooks Bridges <bbridges at call48.com>
Date: Thu, 28 Oct 2021, 23:26
To: "Kamailio (SER) - Users Mailing List" <sr-users at lists.kamailio.org>
Subject: [SR-Users] htable shtcn expressions
Referring to the expressions outlined at http://www.kamailio.org/wiki/cookbooks/5.4.x/pseudovariables#shtcn_htable_exp , is there any additional documentation or examples floating around that further explains how the right and left prefix matching works?  The rest of them are pretty clear, but I'm having troubles with these and can't get them working like I would expect them to work.
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