<div dir="ltr">Daniel,<div><br></div><div>"(?i)^test$" is just an example, actually regex is a little more complicated.<br></div><div><br></div><div>In this case, libpcre3 is a good way to use PCRE expressions.</div><div><br></div><div>Thanks!</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">вт, 13 окт. 2020 г. в 16:48, Daniel-Constantin Mierla <<a href="mailto:miconda@gmail.com">miconda@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Hello,</p>
<p>libpcre3 is known to be very fast, not sure you will notice any
performance impact because of runtime regular expression parsing,
everything being done in memory and for sure not with simple
expressions like <span>"(?i)^test$"</span><span>. This happens
because the parameters can have variables, which are first
evaluated, then used for matching.<br>
</span></p>
<p><span>Anyhow, a variant of the function with static parameter for
regex can be added easily.</span></p>
<p><span>On the other hand, you seem to compare with a full value,
so you can just use string comparison functions:</span></p>
<p><span> *
<a href="https://www.kamailio.org/docs/modules/stable/modules/textops.html#textops.f.cmp_str" target="_blank">https://www.kamailio.org/docs/modules/stable/modules/textops.html#textops.f.cmp_str</a><br>
</span></p>
<p><span>Cheers,<br>
Daniel<br>
</span></p>
<div>On 13.10.20 15:22, Marat Gareev wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Henning, Daniel,
<div>thanks for your replies.</div>
<div><br>
</div>
<div>1. I don't want to use a Regex module because it might have
a performance impact.</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Matches
the given string parameter against the regular expression
pcre_regex, which is compiled in runtime into a PCRE object.<br>
</blockquote>
<div> </div>
<div>2. I was surprised to find that the operator "=~" is case
insensitive:</div>
<div>
<div>
<div style="white-space:pre-wrap;font-size:14px"><span style="color:rgb(0,0,255)">if</span> (regcomp(re, (<span style="color:rgb(0,0,255)">char</span>*) exp->r.param,</div>
<div style="white-space:pre-wrap;font-size:14px"> REG_EXTENDED|REG_NOSUB|REG_ICASE) ){</div>
<div style="white-space:pre-wrap;font-size:14px"> LM_CRIT(<span style="color:rgb(163,21,21)">"bad re \"%s\"\n"</span>, (<span style="color:rgb(0,0,255)">char</span>*) exp->r.param);</div>
<div style="white-space:pre-wrap;font-size:14px"> pkg_free(re);</div>
<div style="white-space:pre-wrap;font-size:14px"> <span style="color:rgb(0,0,255)">return</span> E_BAD_RE;</div>
<div style="white-space:pre-wrap;font-size:14px">}</div>
<div style="white-space:pre-wrap">so that enough for me:</div>
<div style="white-space:pre-wrap;font-size:14px"><span style="white-space:pre-wrap">$tU =~ </span><span style="white-space:pre-wrap;color:rgb(163,21,21)">"^test$"</span>
</div>
<div style="white-space:pre-wrap;font-size:14px"><span style="white-space:pre-wrap;color:rgb(163,21,21)">
</span></div>
<div><span style="white-space:pre-wrap">Btw, w</span>hat
if I need case sensitive validation? Should I use the
Regex module?</div>
<div style="font-size:14px"><span style="font-size:small"><br>
</span></div>
<div style="font-size:14px"><span style="font-size:small">Regards,</span></div>
<div style="font-size:14px"><span style="font-size:small">Marat</span></div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">вт, 13 окт. 2020 г. в 14:17,
Daniel-Constantin Mierla <<a href="mailto:miconda@gmail.com" target="_blank">miconda@gmail.com</a>>:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Hello,</p>
<p>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.</p>
<p>As mentioned by Henning, regex should be an alternative,
or maybe dialplan if one wants db-storage+caching of those
regex rules.</p>
<p>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.</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div>On 13.10.20 13:04, Henning Westerholt wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal"><span>Hello,</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span lang="EN-GB">just an idea,
have you already tried this module: <a href="https://www.kamailio.org/docs/modules/stable/modules/regex.html" target="_blank">https://www.kamailio.org/docs/modules/stable/modules/regex.html</a></span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">Cheers,</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">Henning</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">-- </span></p>
<p class="MsoNormal"><span lang="EN-GB">Henning
Westerholt – </span><span><a href="https://skalatan.de/blog/" target="_blank"><span style="color:rgb(5,99,193)" lang="EN-GB">https://skalatan.de/blog/</span></a></span><span lang="EN-GB"></span></p>
<p class="MsoNormal"><span lang="EN-GB">Kamailio
services – </span><span><a href="https://gilawa.com/" target="_blank"><span style="color:rgb(5,99,193)" lang="EN-GB">https://gilawa.com</span></a></span><span>
<span lang="EN-GB"></span></span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class="MsoNormal" style="margin-left:35.4pt"><b>From:</b>
sr-users <a href="mailto:sr-users-bounces@lists.kamailio.org" target="_blank"><sr-users-bounces@lists.kamailio.org></a>
<b>On Behalf Of </b>Marat Gareev<br>
<b>Sent:</b> Tuesday, October 13, 2020 10:55 AM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <a href="mailto:sr-users@lists.kamailio.org" target="_blank"><sr-users@lists.kamailio.org></a><br>
<b>Subject:</b> [SR-Users] Caseless regex</p>
</div>
<p class="MsoNormal" style="margin-left:35.4pt"> </p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Hello,</p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> </p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Is
it possible write more readable regular expression</p>
</div>
<div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt;line-height:14.25pt"><span>if</span><span>
($tU =~ </span><span>"(?i)^test$"</span><span>)
{</span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt;line-height:14.25pt"><span>
...</span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt;line-height:14.25pt"><span>}</span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt;line-height:14.25pt"><span style="font-family:Arial,sans-serif;color:black">instead of</span><span>
</span><span>"^[tT][eE][sS][tT]$"</span><span>?</span><span style="color:black"></span></p>
</div>
</div>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> </p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">On
the first option, I get the error:</p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">0(47250)
ERROR: <core> [core/rvalue.c:3038]:
fix_match_rve(): Bad regular expression</p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> </p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Regards,</p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Marat</p>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
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Daniel-Constantin Mierla -- <a href="http://www.asipto.com" target="_blank">www.asipto.com</a>
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<pre cols="72">--
Daniel-Constantin Mierla -- <a href="http://www.asipto.com" target="_blank">www.asipto.com</a>
<a href="http://www.twitter.com/miconda" target="_blank">www.twitter.com/miconda</a> -- <a href="http://www.linkedin.com/in/miconda" target="_blank">www.linkedin.com/in/miconda</a>
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