13 Oct
2020
13 Oct
'20
4:58 p.m.
Daniel,
"(?i)^test$" is just an example, actually regex is a little
more complicated.
In this case, libpcre3 is a good way to use PCRE expressions.
Thanks!
вт, 13 окт. 2020 г. в 16:48, Daniel-Constantin Mierla <miconda(a)gmail.com>om>:
Hello,
libpcre3 is known to be very fast, not sure you will notice any
performance impact because of runtime regular expression parsing,
everything being done in memory and for sure not with simple expressions
like "(?i)^test$". This happens because the parameters can have
variables, which are first evaluated, then used for matching.
Anyhow, a variant of the function with static parameter for regex can be
added easily.
On the other hand, you seem to compare with a full value, so you can just
use string comparison functions:
*
https://www.kamailio.org/docs/modules/stable/modules/textops.html#textops.f…
Cheers,
Daniel
On 13.10.20 15:22, Marat Gareev wrote:
Henning, Daniel,
thanks for your replies.
1. I don't want to use a Regex module because it might have a performance
impact.
Matches the given string parameter against the
regular expression
pcre_regex, which is compiled in runtime into a PCRE object.
2. I was surprised to find that the operator "=~" is case insensitive:
if (regcomp(re, (char*) exp->r.param,
REG_EXTENDED|REG_NOSUB|REG_ICASE) ){
LM_CRIT("bad re \"%s\"\n", (char*) exp->r.param);
pkg_free(re);
return E_BAD_RE;
}
so that enough for me:
$tU =~ "^test$"
Btw, what if I need case sensitive validation? Should I use the Regex
module?
Regards,
Marat
вт, 13 окт. 2020 г. в 14:17, Daniel-Constantin Mierla <miconda(a)gmail.com>om>:
Hello,
adding some more details to mention that regex operations done by the
core (the =~ operator) use the libc posix regex functions, which do not
support extended syntax. Also, these operations done by core use the case
insensitive flag.
As mentioned by Henning, regex should be an alternative, or maybe
dialplan if one wants db-storage+caching of those regex rules.
Moreover, if the above are not enough, a kemi embedded interpreter (e.g.,
app_lua, app_python) can be used with inline execution in kamailio.cfg
routing blocks -- those external scripting languages should have many
options for regex matching.
Cheers,
Daniel
On 13.10.20 13:04, Henning Westerholt wrote:
Hello,
just an idea, have you already tried this module:
https://www.kamailio.org/docs/modules/stable/modules/regex.html
Cheers,
Henning
--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com
*From:* sr-users <sr-users-bounces(a)lists.kamailio.org>
<sr-users-bounces(a)lists.kamailio.org> *On Behalf Of *Marat Gareev
*Sent:* Tuesday, October 13, 2020 10:55 AM
*To:* Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
<sr-users(a)lists.kamailio.org>
*Subject:* [SR-Users] Caseless regex
Hello,
Is it possible write more readable regular expression
if ($tU =~ "(?i)^test$") {
...
}
instead of "^[tT][eE][sS][tT]$"?
On the first option, I get the error:
0(47250) ERROR: <core> [core/rvalue.c:3038]: fix_match_rve(): Bad regular
expression
Regards,
Marat
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Funding: https://www.paypal.me/dcmierla