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RegEx Parsing Error
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Devin Rader
I am trying to screen scrape some data from weather.com, but when I load the
Response Stream into a Regex object as the string pattern, it gives this
exception at run-time:

Server Error in '/myApp' Application

parsing ".... the source of weather.com page goes here...."

Source Error

Line 55: Regex regexp = new Regex(result);

Heres my scrapeing code:

    string result;
    WebResponse objResponse;
    WebRequest objRequest System.Net.HttpWebRequest.Create("http://www.weather.com/weather/local/63141
");
    objResponse = objRequest.GetResponse();
    StreamReader sr = new StreamReader(objResponse.GetResponseStream());
    result = sr.ReadToEnd();

I have tried using different Regex Options, but it always ends up with this
error. Anyone have any ideas?

Thanks

devin
stlnet.org
Reply to this message...
 
    
Scott Mitchell (VIP)
RegEx Parsing ErrorI think you are using the Regeex class incorrectly. Note
the docs:
ms-help://MS.VSCC/MS.MSDNVS/cpref/html/frlrfsystemtextregularexpressionsrege
xclassctortopic2.htm ; if you pass in a string through the constructor it
should be the pattern. Patterns, for regular expressions, are like:

[0-9]{3}

to match three consecutive digits, for example. There are special
characters in a pattern (like (, ), ^, etc.) and I would be some appearances
of these in the string of the HTML of Weather.com is what is causing the
problem.

Do you mean to search this string based on another regexp pattern? That's
more likely what you're wanting to do, in which case specify the pattern in
the constrcutor then use the Replace or Match(s) methods to find occurrences
of the pattern in the HTML from Weather.com.

Scott Mitchell
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-----Original Message-----
From: Devin Rader [mailto:Click here to reveal e-mail address]
Sent: Monday, January 14, 2002 11:22 AM
To: aspngregexp
Subject: [aspngregexp] RegEx Parsing Error

I am trying to screen scrape some data from weather.com, but when I load
the Response Stream into a Regex object as the string pattern, it gives this
exception at run-time:

Server Error in '/myApp' Application

parsing ".... the source of weather.com page goes here...."

Source Error

Line 55: Regex regexp = new Regex(result);

Heres my scrapeing code:

string result;
WebResponse objResponse;
WebRequest objRequest System.Net.HttpWebRequest.Create("http://www.weather.com/weather/local/63141
");
objResponse = objRequest.GetResponse();
StreamReader sr = new
StreamReader(objResponse.GetResponseStream());
result = sr.ReadToEnd();

I have tried using different Regex Options, but it always ends up with
this error. Anyone have any ideas?

Thanks

devin
stlnet.org

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System.IO.StreamReader
System.Net.HttpWebRequest
System.Net.WebRequest
System.Net.WebResponse
System.Text.RegularExpressions.Regex
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