[Kamailio-Devel] new feature: re.subst transformation

[Daniel-Constantin Mierla]

Hello,

using the latest development work and the newest 
pseudo-variable&transformation framework 
(http://lists.kamailio.org/pipermail/users/2008-December/020918.html), 
the textops module offers a new class of transformation for regular 
expressions.

By now, it implements {re.subst,expression} - ability to do Perl-like 
substitution of string value pseudo-variables:
http://www.kamailio.org/dokuwiki/doku.php/transformations:devel#re.subst_expression

Here is an example to extract username part from R-URI using this 
transformation:

$var(user) = $(ru{re.subst,/^sip:(.*)@(.*)/\1/});

Now, the subst operation becomes very handy, old tricks to copy in R-URI 
and use subst*() functions from textops module, or copy in avps and use 
avpops module are no longer required.

This implementation can be used as example by developers to learn how to 
export new transformations from other modules.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
http://www.asipto.com