asterisk users - Aug 2016 - Trouble applying regex to dialplan variable that contains double-quotes

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?

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 Villac??s 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

El 08/08/16 a las 21:34, Eric Wieling escribi?:
>
> 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.
>
I do not have any [compat] section in my /etc/asterisk/asterisk.conf file. Also
the previous assignments to RX and T1 work correctly and the values are set as
they appear in the dialplan. It is only the evaluation of the regex operator
inside the $[ that
gives me trouble. I thought the QUOTE() function would be the way to use a
dialplan variable with special characters inside an expression, but apparently
the backslash-double quote sequence is not being recognized as an escape
sequence for a literal
double-quote character in the string. See below for the actual result. So, what
am I doing wrong?
> On 08/08/2016 04:31 PM, Alex Villac??s Lasso wrote:
>> I am writing a dialplan context under asterisk 11.21.0 to handle SIP
message routing between registered SIP peers using chan_sip. I am having trouble
with double-quotes when the source peer uses a display name, which appears in
quotes before the SIP
>> URI. I want to extract the SIP URI from MESSAGE(from) in order to
(conditionally) route a failure message back to the source peer.
>>
>> My test dialplan sets up variables like these:
>>
>> exten => _X.,n,Set(RX=".*<(.+)>")
>> exten => _X.,n,Set(T1="Example name" <sip:example at
example.com>)
>>
>> If I just apply the regex operator (:) on T1 using regexp RX, like
this:
>>
>> exten => _X.,n,Set(FROM_SIPURI=$[${T1}:${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?
>>
>>
>