[Kamailio-Users] PCRE / Regex Module

[Iñaki Baz Castillo]

El Viernes, 18 de Septiembre de 2009, Iñaki Baz Castillo escribió:
> El Viernes, 18 de Septiembre de 2009, Brandon Armstead escribió:
> > Hello,
> >     I have the following pcre regex method call:
> >
> >     pcre_match("$hdr(From)", "(?i)^(restricted|anonymous|private|unknown|
> 
> unavailable)")
> 
> > to match calls that are sent without a proper ANI in a case-insensitive
> > manner, however it does not seem to return true for the following example
> > From Header:
> >
> > From Header: "Unavailable"
> > <sip:Restricted at 192.168.47.68<sip%3ARestricted at 192.168.47.68>
> >
> > >;tag=gK07327e23
> >
> > Any thoughts / input is appreciated, and as always thank you for your
> > help!
> 
> You are using ^ symbol which means that the string MUST START by:
>   restricted|anonymous|private|unknown|unavailable
> 
> But your string $hdr("From") starts by "Unavailable" (*including* the
> quotation marks so it doesn't match).
> 
> If the From URI username is enough (Restricted) you could do:
> 
>   pcre_match("$dU", "(?i)^(restricted|anonymous|private|unknown|
>   unavailable)")
> 
> If you need to match the Display-Name ("Unavailable") then you must add the
> quotation marks to the regular expression:
> 
>   pcre_match("$fn", "(?i)^(\")?(restricted|anonymous|private|unknown|
>   unavailable)(\")?")
> 
> Note that I use $fn rather than $hdr("From"), being $fn the From
>  Display-Name:
>  http://kamailio.org/dokuwiki/doku.php/pseudovariables:1.5.x#from_display_n
> ame
> 

Also, it's better if you use =~ instead of pcre_match since =~ compiles the 
regular expression during script file initial parsing.
'regex' module is useful if you use the pcre_match_group() function (which 
matches against the content of a file separated by sections).


-- 
Iñaki Baz Castillo <ibc at aliax.net>