Check for string absence in regex

[varunhome@gmail.com]

Hi,
I want to check for the absence of a string in regular expression. For
example, if the string is "Error opening file: Permission denied.
Aborting.", I want to check for absence of the string "Permission ". I
have tried many possibilities without success.

Thanks for any help,

Varun Sud

[Rahul Anand]

RE: Check for string absence in regex

"varunhome@gmai l.com" wrote:
[color=blue]
> Hi,
> I want to check for the absence of a string in regular expression. For
> example, if the string is "Error opening file: Permission denied.
> Aborting.", I want to check for absence of the string "Permission ". I
> have tried many possibilities without success.
>
> Thanks for any help,
>
> Varun Sud
>[/color]

Hi Varun,

You can achieve the same using the code snippet below. You can choose either
string basic operation or regex match.

<CODE>

string str = "Error opening file: Permission denied. Aborting.";
string pattern = "Permission ";

// Using RegEx methods
Regex reg = new Regex(pattern);
if(! reg.IsMatch(str ))
Console.WriteLi ne("Not Found (RegEx operation)");
else
Console.WriteLi ne("Found Match (RegEx operation)");

// Using string methods
if(str.IndexOf( pattern) < 0)
Console.WriteLi ne("Not Found (string operation)");
else
Console.WriteLi ne("Found Match (string operation)");

</CODE>

Hope it will help.

--
Cheers,
Rahul Anand