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<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 class="moz-cite-prefix">On 05.10.21 10:05, Daniel-Constantin
Mierla wrote:<br>
</div>
<blockquote type="cite"
cite="mid:2b281074-d759-b99f-e088-2cf1e73950d7@gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<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 class="moz-cite-prefix">On 04.10.21 19:50, Joel Serrano
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMtXxQn6LftHB=WFtTZe41hSWAv+k2Pixzcu9JPw1F_tTqgFfQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<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"
moz-do-not-send="true">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"
moz-do-not-send="true">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" moz-do-not-send="true">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>
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<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com" moz-do-not-send="true">www.asipto.com</a>
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</blockquote>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training - Online
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