.NET Regex pattern?

Question

var flashvars = {
        "client.allow.cross.domain" : "0", 
        "client.notify.cross.domain" : "1",
};

For some strange reason does not want to be parsed with this code (in C#).

private void parseVariables() {
       String page;
       Regex flashVars = new Regex("var flashvars = {(.*?)}", RegexOptions.Multiline | RegexOptions.IgnoreCase);
       Regex var = new Regex(@"""(.*?)"",", RegexOptions.Multiline | RegexOptions.IgnoreCase);
       Match flashVarsMatch;
       MatchCollection matches;
       String vars = "";

       if (!IsLoggedIn)
       {
            throw new NotLoggedInException();
       }

       page = Request(URL_CLIENT);

       flashVarsMatch = flashVars.Match(page);

       matches = var.Matches(flashVarsMatch.Groups[1].Value);

       if (matches.Count > 0)
       {
         foreach (Match item in matches)
         {
            vars += item.Groups[1].Value.Replace("\" : \"", "=") + "&";
         }
    }
}

@Scott: just to be pedantic: C# is a programming language which has no regex support at all (unlike JavaScript). OTOH, the .NET Framework has the System.Text.RegularExpressions.Regex class. — John Saunders
– John Saunders, Commented Apr 29, 2010 at 19:41

vfilby · Accepted Answer · 2010-04-29 19:40:48Z

5

Use RegexOptions.SingleLine rather than RegexOptions.Multiline

RegexOptions.Singleline

Specifies single-line mode. Changes the meaning of the dot (.) so it matches every character (instead of every character except\n).

http://msdn.microsoft.com/en-us/library/443e8hc7(vs.71).aspx

answered Apr 29, 2010 at 19:40

vfilby

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1 Comment

Scott Over a year ago

Problem fixed. Thanks vfilby and Max Shawabkeh.

Max Shawabkeh · Accepted Answer · 2010-04-29 19:45:21Z

2

You need to use the Singleline flag. Otherwise a period doesn't match new lines. MultiLine is used to make ^ and $ match at start/end of lines. Also, you need to escape the curly brackets:

Regex flashVars = new Regex(@"var flashvars = \{(.*?)\}", RegexOptions.Singleline | RegexOptions.IgnoreCase);

edited Apr 29, 2010 at 19:45

answered Apr 29, 2010 at 19:39

Max Shawabkeh

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5 Comments

Scott Over a year ago

I cannot seem to find the DotAll flag, are you sure it's a valid RegexOption for C# .NET?

vfilby Over a year ago

DotAll is known as single line, see this answer: stackoverflow.com/questions/2740176/net-regex-pattern/….

Max Shawabkeh Over a year ago

Fixed. Used to Python's naming. The .NET equivalent is Singleline.

Philip Daubmeier Over a year ago

You have to escape the backslash for the c# string with another one, so it should be "var flashvars = \\{(.*?)\\}"

Max Shawabkeh Over a year ago

@Philip Daubmeier: Made the string raw.

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