[asterisk-users] How to encode plus sign in REGEX function in dialplan?

Rusty Newton
Fri, 06 Nov 2015 13:06:57 -0000

On Thu, Nov 5, 2015 at 12:49 AM, Recursive <lists at binarus.de>
wrote:
> Dear all,
>
> I have made a fairly complex dialplan where I am using the REGEX function
in many places. This works so far, but I wasn't able to solve the following
problem. What I would like to do is the following (please note that this is
normal regex syntax and obviously not what the REGEX function expects, but I
hope it shows the idea):
>
>   same => n(A1), GotoIf($[${REGEX("^\+49.*" ${EXTEN})}]?:A2)
>
> This line should make Asterisk jump to label A2 if the extension begins
with +49. Since the plus sign is a special char in regexes, I have escaped it
with \ as usual. But that does not work; the pattern is not matched and the goto
is not executed when the extension begins with +49.
>
> What I already have tried:
>
> 1) same => n(A1), GotoIf($[${REGEX("^\\+49.*" ${EXTEN})}]?:A2)
>
> 2) same => n(A1), GotoIf($[${REGEX("^\\\+49.*"
${EXTEN})}]?:A2)
>
> 3) same => n(A1), GotoIf($[${REGEX("^\\\\+49.*"
${EXTEN})}]?:A2)
>
> 4) same => n,     Set(REPAT=^+49.*)
>    same => n(A1), GotoIf($[${REGEX(${REPAT} ${EXTEN})}]?:A2)
>
> 5) same => n, Set(REPAT="^+49.*")
>    same => n(A1), GotoIf($[${REGEX(${REPAT} ${EXTEN})}]?:A2)
>
> 6) same => n, Set(REPAT=^+49.*)
>    same => n(A1), GotoIf($[${REGEX("${REPAT}" ${EXTEN})}]?:A2)
>
> 7) same => n, Set(REPAT="^+49.*")
>    same => n(A1), GotoIf($[${REGEX("${REPAT}" ${EXTEN})}]?:A2)
>
> Neither of these worked.
>
> Actually, the REGEX function is not able to handle normal regular
expressions. To make things worse, there doesn't seem to be any
documentation. Could anybody please point me to documentation or tell me how
write that very simple pattern?
>
> Thank you very much,
>
> Recursive
>
> P.S. This happens in Asterisk 13.6.0 - I haven't tested with other
versions.

The documentation for that function is available at the CLI "core show
function REGEX" and is available on the wiki at
https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Function_REGEX

It should be able to handle typical regular expression. I don't see
anything wrong with what you are doing. Please file a bug at
issues.asterisk.org/jira.  Do include a debug log on the issue
captured when Asterisk attempts to execute these extensions.

https://wiki.asterisk.org/wiki/display/AST/Collecting+Debug+Information

Thanks,

--
Rusty Newton
Digium, Inc. | Community Support Manager
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
direct: +1 256 428 6200

Check us out at: http://digium.com & http://asterisk.org