[asterisk-users] Trouble applying regex to dialplan variable that contains double-quotes

[Eric Wieling]

How Set handles quotes can be changed with the 'app_set' setting in the 
[compat] section of /etc/asterisk/asterisk.conf.  See also: 
https://wiki.asterisk.org/wiki/display/AST/Application_Set Perhaps you 
have the value left over from an old Asterisk setup.

On 08/08/2016 04:31 PM, Alex Villací­s Lasso wrote:
> I am writing a dialplan context under asterisk 11.21.0 to handle SIP 
> message routing between registered SIP peers using chan_sip. I am 
> having trouble with double-quotes when the source peer uses a display 
> name, which appears in quotes before the SIP URI. I want to extract 
> the SIP URI from MESSAGE(from) in order to (conditionally) route a 
> failure message back to the source peer.
>
> My test dialplan sets up variables like these:
>
> exten => _X.,n,Set(RX=".*<(.+)>")
> exten => _X.,n,Set(T1="Example name" <sip:example at example.com>)
>
> If I just apply the regex operator (:) on T1 using regexp RX, like this:
>
> exten => _X.,n,Set(FROM_SIPURI=$[${T1}:${RX}])
>
> ...I get this syntax error:
>
> [2016-08-08 15:04:02] WARNING[1653][C-00000000]: ast_expr2.fl:470 
> ast_yyerror: ast_yyerror():  syntax error: syntax error, unexpected 
> ':', expecting '-' or '!' or '(' or '<token>'; Input:
> "Example name" <sip:example at example.com>:".*<(.+)>"
>                                         ^
> (caret points at the colon character)
>
> If I enclose the T1 variable in double quotes, like this:
>
> exten => _X.,n,Set(FROM_SIPURI=$["${T1}":${RX}])
>
> ...I get this syntax error:
>
> [2016-08-08 15:05:40] WARNING[1653][C-00000000]: ast_expr2.fl:470 
> ast_yyerror: ast_yyerror():  syntax error: syntax error, unexpected 
> '<token>', expecting $end; Input:
> ""Example name" <sip:example at example.com>":".*<(.+)>"
>   ^
> (caret points at letter E)
>
> If I use the QUOTE() function to quote the double quotes before 
> applying the regexp, like this:
>
> exten => _X.,n,Set(FROM_SIPURI=$[${QUOTE(${T1})}:${RX}])
>
> ... I get this syntax error:
>
> [2016-08-08 14:53:35] WARNING[1653][C-00000000]: ast_expr2.fl:470 
> ast_yyerror: ast_yyerror():  syntax error: syntax error, unexpected 
> '<token>', expecting $end; Input:
> "\"Example name\" <sip:example at example.com>":".*<(.+)>"
>    ^
> (caret points at letter E)
>
> Currently I am working around the issue by using REPLACE() to strip 
> all double-quotes, but I believe this is not a correct solution. How 
> should I write the $[ expression so that the double-quotes are handled 
> correctly?
>
>

-- 
if at first you don't succeed, skydiving isn't for you