Re: [xml] Regular Expression Problem

[Ashwin <ashwins huawei com>]

> 
> 
>    Hi,
> 
>    While  evaluating  an expression against the following pattern, libxml
>    is returning an internal error.
> 
>    The Pattern is
>    -(conf:[a-zA-Z0-9.:_\-]+|conn:[a-zA-Z0-9.:_\-]+)/dialog:[a-zA-Z0-9.:_\
>    -]+
> 
>    The expression is -conn:10600-0-3689-217.198.224.50.5060
> 
>    While debugging I found that it fails in xmlFARegExecRollBack function
>    because of a rollback on an empty stack.... Is this a problem?

>  Hum, unfortunately this looks like a different problem, it seems
>  to take a lot of cycles and I'm afraid there is something serious going
> on and that can be only studied and fixed by debugging the generated
> automata.
>  reducing the expression and the input to provide a minimal automata
> showing the problem is a good first step.
I reduced the input pattern to
(conf:[a-zA-Z0-9.:_\-]+|conn:[a-zA-Z0-9.:_\-]+)
And the given input works for this, but as soon as I add the dialog
expression it fails, also it passes if I reduce the length of the input
expression,
Something like conn:10600-0-3689-217.198 or reduce it even further it gives
a expression match failure but no error....

Regards
Ashwin