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@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@call48.com>
Date: Thu, 28 Oct 2021, 23:26
To: "Kamailio (SER) - Users Mailing List" <sr-users@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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