[asterisk-users] Logical AND

[Tilghman Lesher]

On Sunday 25 May 2008 07:10:22 Adrian Marsh wrote:
> exten => s,n,ExecIf( $[  $[ "${PSTN_NUM:0:1}" != "0" ] & $[
> ${LEN(${PSTN_NUM})} = 10 ]  ] |Set|PSTN_NUM=001${PSTN_NUM})
>
>     -- Executing [s at macro-setpstncli:8] NoOp("SIP/427-b7d9a9a0",
> "0123456789") in new stack
>     -- Executing [s at macro-setpstncli:9] ExecIf("SIP/427-b7d9a9a0", " 0
> |Set|PSTN_NUM=0010123456789") in new stack
>     -- Executing [s at macro-setpstncli:10] NoOp("SIP/427-b7d9a9a0",
> "0010123456789") in new stack

There's an extra space between the opening "(" and the opening "$[", so
the result is space-zero, which is not the same thing as zero.  Any string
that is not exactly "0" (or the empty string), such as "foo", " ", or " 0" is
true.

-- 
Tilghman