C# extract string using regular expression

Question

I have a html string which i'm parsing which looks like below. I need to get the value of @Footer.

strHTML = "<html><html>\r\n\r\n<head>\r\n<meta http-equiv=Content-Type 
           content=\"text/html; charset=windows-1252\">\r\n
           <meta name=Generator content=\"Microsoft Word 14></head></head><body> 
           <p>@Footer=CONFIDENTIAL<p></body></html>"

I have tried the below code, how do i get the value?

Regex m = new Regex("@Footer", RegexOptions.Compiled);
foreach (Match VariableMatch in m.Matches(strHTML.ToString()))
{
     Console.WriteLine(VariableMatch);
}

Tim S. · Accepted Answer · 2013-08-26 17:01:44Z

2

You need to capture the value after the =. This will work, as long as the value cannot contain any < characters:

Regex m = new Regex("@Footer=([^<]+)", RegexOptions.Compiled);
foreach (Match VariableMatch in m.Matches(strHTML.ToString()))
{
    Console.WriteLine(VariableMatch.Groups[1].Value);
}

answered Aug 26, 2013 at 17:01

Tim S.

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Luke Willis · Accepted Answer · 2013-08-26 17:04:31Z

2

You can do this with regex, but it's not necessary. One simple way to do this would be:

var match = strHTML.Split(new string[] { "@Footer=" }, StringSplitOptions.None).Last();
match = match.Substring(0, match.IndexOf("<"));

This assumes that your html string only has one @Footer.

answered Aug 26, 2013 at 17:04

Luke Willis

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ncourcy84 · Accepted Answer · 2013-08-26 17:02:29Z

1

Your regex will match the string "@Footer". The value of the match will be "@Footer".

Your regex should look like this instead :

Regex regex = new Regex("@Footer=[\w]+");
string value = match.Value.Split('=')[1];

answered Aug 26, 2013 at 17:02

ncourcy84

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Louis Ricci · Accepted Answer · 2013-08-26 17:02:51Z

1

Use a matching group.

Regex.Matches(strHTML, @"@Footer=(?<VAL>([^<\n\r]+))").Groups["VAL"].Value;

answered Aug 26, 2013 at 17:02

Louis Ricci

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King King · Accepted Answer · 2013-08-26 17:09:50Z

0

If that's all your string, we can use string methods to solve it without touching regex stuff:

var result = strHTML.Split(new string[]{"@Footer=", "<p>"}, StringSplitOptions.RemoveEmptyEntries)[1]

answered Aug 26, 2013 at 17:09

King King

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