Regular expression induced the program can't respond

[ch2x]

Now I have a regular expression:
string pattern = @"[\s\S]*?(?<content>\< div
id='news'\>\<di v[\s\S]*?\<\/div\>[\s\S]*?\<\/div\>)[\s\S]*";
I want to use this pattern to match a html file's content,and replace the
file's content with ${news}.
But if the content is not match the pattern ,the program will lose response.
Why ? and what shall I do?

[Nicholas Paldino [.NET/C# MVP]]

Re: Regular expression induced the program can't respond

ch2x,

What do you mean the program will lose response? It's possible that the
regex engine is taking a long time to actually process this expression, and
since you do it in the main thread of a windows forms application, that is
why your app hangs.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"ch2x" <ch2x@163.com > wrote in message
news:eTq5wslaFH A.580@TK2MSFTNG P15.phx.gbl...[color=blue]
> Now I have a regular expression:
> string pattern = @"[\s\S]*?(?<content>\< div
> id='news'\>\<di v[\s\S]*?\<\/div\>[\s\S]*?\<\/div\>)[\s\S]*";
> I want to use this pattern to match a html file's content,and replace the
> file's content with ${news}.
> But if the content is not match the pattern ,the program will lose
> response.
> Why ? and what shall I do?
>
>
>
>
>[/color]

[ch2x]

Re: Regular expression induced the program can't respond

Thanks for you reply.
When the regex is not match the html file's content ,it is as what you said:
regex engine will take a long time to actually proccess this expression.
It is maybe the best way to resolve my matter,if there is a timeout event
can be touched off.
But regex engine doesn't have this event.and now what shall I do?



"Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c om>[color=blue]
> ch2x,
>
> What do you mean the program will lose response? It's possible that[/color]
the[color=blue]
> regex engine is taking a long time to actually process this expression,[/color]
and[color=blue]
> since you do it in the main thread of a windows forms application, that is
> why your app hangs.
>
> Hope this helps.
>
>
> --
> - Nicholas Paldino [.NET/C# MVP]
> - mvp@spam.guard. caspershouse.co m
>
> "ch2x" <ch2x@163.com > wrote in message
> news:eTq5wslaFH A.580@TK2MSFTNG P15.phx.gbl...[color=green]
> > Now I have a regular expression:
> > string pattern = @"[\s\S]*?(?<content>\< div
> > id='news'\>\<di v[\s\S]*?\<\/div\>[\s\S]*?\<\/div\>)[\s\S]*";
> > I want to use this pattern to match a html file's content,and replace[/color][/color]
the[color=blue][color=green]
> > file's content with ${news}.
> > But if the content is not match the pattern ,the program will lose
> > response.
> > Why ? and what shall I do?
> >
> >
> >
> >
> >[/color]
>
>[/color]