<div dir="ltr">Hi Daniel, <div><br></div><div>Thank you for clarifying how subst_hf works!</div><div><br></div><div>Regarding the size, it does in fact go over the 1024 limit, in this setup we are using firebase tokens which are 1162 characters long, and what I'm trying to do is to prefix the value we receive with some more characters, for a total of 1178 characters.</div><div><br></div><div>So something along:</div><div><br></div><div><div>subst_hf("X-myheader", "/^(.*)/myprefix \1/", "a")</div></div><div><br></div><div><br></div><div>Would it be possible to expose that define for REPLACE_BUFFER_SIZE as a modparam to be configurable? </div><div><br></div><div>Thanks for looking into this!</div><div><br></div><div>Best, </div><div>Joel.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 5, 2021 at 4:17 AM Daniel-Constantin Mierla <<a href="mailto:miconda@gmail.com">miconda@gmail.com</a>> wrote:<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>Regarding:</p>
<p>"""<br>
Oct 4 10:44:44 kamailio-n1 kamailio[20324]: ERROR: <core>
[core/re.c:363]: replace_build(): Buffer too small<br>
"""<br>
</p>
<p>That seems to be related to the define of REPLACE_BUFFER_SIZE,
which is 1024. Changing it requires to recompile kamailio. Is the
value to be set bigger than 1024?<br>
</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div>On 05.10.21 10:05, Daniel-Constantin
Mierla wrote:<br>
</div>
<blockquote type="cite">
<p>Hello,</p>
<p>the regular expressions in textops have to be POSIX format
(extended, iirc), the remark for perl/sed-like was referring to
the format being '/match/replace/flags' that is common for Perl
scripting and sed parameters.</p>
<p>Practically textops uses the regex functions from libc, does
not depend on libpcre that offers PCRE format for expressions.</p>
<p>The regex supports matching with PCRE and dialplan offers a way
to do substitutions by matching with PCRE library.</p>
<p>I updated the readme of textops to reflect somehow better the
above.</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div>On 04.10.21 19:50, Joel Serrano
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">So now when combined with subst_hf to actually
edit the header value, I'm getting this error:
<div><br>
</div>
<div>Oct 4 10:44:44 kamailio-n1 kamailio[20324]: ERROR:
<core> [core/re.c:363]: replace_build(): Buffer too
small<br>
Oct 4 10:44:44 kamailio-n1 kamailio[20324]: ERROR: textops
[textops.c:3110]: subst_hf_f(): textops subst_run failed<br>
</div>
<div><br>
</div>
<div>Can anyone remind me the name of the parameter I have to
adjust to increase the buffer size?</div>
<div><br>
</div>
<div>Thanks, </div>
<div>Joel.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Oct 4, 2021 at 10:46
AM Joel Serrano <<a href="mailto:joel@textplus.com" target="_blank">joel@textplus.com</a>> wrote:<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 dir="ltr">Update:
<div><br>
</div>
<div>I managed to achieve it using the "regex" module with
"pcre_match()", that will take negative lookahead
nicely.</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Oct 4, 2021 at
10:18 AM Joel Serrano <<a href="mailto:joel@textplus.com" target="_blank">joel@textplus.com</a>>
wrote:<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 dir="ltr">Hey guys,
<div><br>
</div>
<div>I'm trying to do a replacement regex using
subst_hf but I can't seem to get the format right
and the docs are confusing.</div>
<div><br>
</div>
<div>
<div><b>subst_hf: </b>docs say it uses perl-like
regex (as I understand it, that would mean PCRE).
Docs also say in the 'subexp' param that it uses
the same format as <b>subst.</b><br>
</div>
<div><b><br>
</b></div>
<div><b>subst: </b>at the beginning it says it uses
perl or sed format, but in the '/re/repl/flags'
param it says that sed format.</div>
</div>
<div><br>
</div>
<div><a href="https://www.kamailio.org/docs/modules/devel/modules/textops.html#textops.f.subst_hf" target="_blank">https://www.kamailio.org/docs/modules/devel/modules/textops.html#textops.f.subst_hf</a><br>
</div>
<div><br>
</div>
<div>
<div style="color:rgb(0,0,0);font-family:Helvetica,Arial,sans-serif;font-size:15px">
<div>
<div>
<h3 style="margin:1em 0px 0.75em;padding:0px 0px 5px 5px;color:rgb(107,83,68);font-family:Scada,Helvetica,sans-serif;font-size:20px;line-height:28px;font-style:italic">4.20. <code>subst_hf(hf,
subexp, flags)</code></h3>
</div>
</div>
</div>
<p style="font-family:Helvetica,Arial,sans-serif;text-align:justify;font-size:15px"><font color="#ff0000">Perl-like substitutions</font><span style="color:rgb(0,0,0)"> in the body of a
header field.</span></p>
<p style="font-family:Helvetica,Arial,sans-serif;text-align:justify;color:rgb(0,0,0);font-size:15px">Meaning
of the parameters is as follows:</p>
<div style="font-family:Helvetica,Arial,sans-serif;font-size:15px">
<ul type="disc">
<li style="color:rgb(0,0,0)">
<p style="text-align:justify"><span><em>hf</em></span> -
header field name.</p>
</li>
<li>
<p style="text-align:justify"><span style="color:rgb(0,0,0)"><em>subexp</em></span><font color="#000000"> - substitution expression
</font><font color="#ff0000">in the same
format as of the 'subst' function</font><font color="#000000"> parameter.</font></p>
</li>
<li style="color:rgb(0,0,0)">
<p style="text-align:justify"><span><em>flags</em></span> -
control flags - it has to be one of: a - all
headers matching the name; f - only first
header matching the name; l - only the last
header matching the name.</p>
</li>
</ul>
</div>
</div>
<div><br>
</div>
<div>
<div style="color:rgb(0,0,0);font-family:Helvetica,Arial,sans-serif;font-size:15px">
<div>
<div>
<h3 style="margin:1em 0px 0.75em;padding:0px 0px 5px 5px;color:rgb(107,83,68);font-family:Scada,Helvetica,sans-serif;font-size:20px;line-height:28px;font-style:italic">4.16. <code>subst('/re/repl/flags')</code></h3>
</div>
</div>
</div>
<p style="font-family:Helvetica,Arial,sans-serif;text-align:justify;font-size:15px"><span style="color:rgb(0,0,0)">Replaces re with repl (</span><font color="#ff0000">sed or perl like</font><font color="#000000">).</font></p>
<p style="font-family:Helvetica,Arial,sans-serif;text-align:justify;color:rgb(0,0,0);font-size:15px">Meaning
of the parameters is as follows:</p>
<div style="font-family:Helvetica,Arial,sans-serif;font-size:15px">
<ul type="disc">
<li>
<p style="text-align:justify"><span style="color:rgb(0,0,0)"><em>'/re/repl/flags'</em></span><font color="#000000"> - </font><font color="#ff0000">sed like regular
expression</font><font color="#000000">.
flags can be a combination of i (case
insensitive), g (global) or s (match
newline don't treat it as end of line).</font></p>
<p style="color:rgb(0,0,0);text-align:justify">'re'
- is regular expression</p>
<p style="color:rgb(0,0,0);text-align:justify">'repl'
- is replacement string - may contain
pseudo-variables</p>
<p style="color:rgb(0,0,0);text-align:justify">'flags'
- substitution flags (i - ignore case, g -
global)</p>
</li>
</ul>
</div>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>I'm trying to use this:</div>
<div><br>
</div>
<div>subst_hf("X-myheader", "/^(?!string1
|example2-|text3 )(.*)/myprefix \1/", "a")<br>
</div>
<div><br>
</div>
<div>In an online tester using PCRE, the format is
correct, but Kamailio doesn't like it:</div>
<div><br>
</div>
<div>Oct 4 09:29:16 cops-n1 cops[15957]: ERROR:
<core> [core/re.c:285]: subst_parser(): bad
regular expression
^(?!string1 |example2-|text3 )(.*) in
/^(?!string1 |example2-|text3 )(.*)/myprefix \1/<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>If I remove the negative lookahead chars (?!)
then kamailio doesn't complain but the regex doesn't
do what I want.</div>
<div><br>
</div>
<div>Does this mean that Kamailio won't support
negative lookahead for subst regex replacements?</div>
<div><br>
</div>
<div>What I'm trying to achieve is something along:</div>
<div><br>
</div>
<div>"If the value of the header Myheader doesn't
start with ABC, DEF or HIJ, then prefix it with XYZ"</div>
<div><br>
</div>
<div>Any suggestions/ideas on how to achieve this?</div>
<div><br>
</div>
<div><br>
</div>
<div>Thanks, </div>
<div>Joel.</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
</blockquote>
</div>
</blockquote>
</div>
<br>
<fieldset></fieldset>
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<pre cols="72">--
Daniel-Constantin Mierla -- <a href="http://www.asipto.com" target="_blank">www.asipto.com</a>
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</blockquote>
<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>
Kamailio Advanced Training - Online
Nov 08-11, 2021 (Europe Timezone) - Nov 22-25, 2021 (America Timezone)
* <a href="https://www.asipto.com/sw/kamailio-advanced-training-online/" target="_blank">https://www.asipto.com/sw/kamailio-advanced-training-online/</a></pre>
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</blockquote></div>