« Return to Thread: Plus character in EXPECT string gives "Invalid preceding regular expression" error

Re: Plus character in EXPECT string gives "Invalid preceding regular expression" error

by Jan-Henrik Haukeland :: Rate this Message:

On Jan 14, 2012, at 8:25 PM, Lukasz Piwowarek wrote:

> Hi
>
>
> I am trying to use Monit to check Redis DB like this:
>
>
> if failed port 6379
>
> send "PING"
>
> expect "+PONG"
>
> send "SET monit_test_key \r\nalive\r\n"
>
> expect "+OK"
>
> send "EXISTS monit_test_key\r\n"
>
> expect ":1"
>
> then
>
> restart
>
>
> The issue is Monit reads the + character as a regular expression and throws an error on start: Invalid preceding regular expression.
>
>
> Is there some way around this?

Escape the + or use a character class. That is, either

expect "\+PONG"
or
expect "[+]PONG"

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« Return to Thread: Plus character in EXPECT string gives "Invalid preceding regular expression" error