I need help for my Regex in C#

Question

I'm trying to find a CSS URL using a regex but having no experience with it, and I'm lost.

After research , I've made this:

^(href)([\S]*(\.css))(\")$

but it works only with

href="/media/system/css/modal.css"

and I've got to find it in:

<link rel="stylesheet" href="/media/system/css/modal.css" type="text/css" />

or

<link rel="stylesheet" href="http://www.campingbellavista.ch/compon [...] k2/css/k2.css" type="text/css" />

If you specify ^ and $ you are stating that the pattern has to starts form the beginning of the line and ends at the end of the line. Try to remove ^ and $ from you regex. And consider to check at the reply of this question:http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags. Being french should not affect how Regex works ;) — Felice Pollano, Jun 21 '11 at 08:46

score 1 · Accepted Answer · answered Jun 21 '11 at 08:43

1

Maybe simplify? ]*href="([^"]+)"

An awesome place to screw around with your regexes I've found was http://www.rubular.com/ .

answered Jun 21 '11 at 08:43

Xedecimal

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Kobi · Answer 2 · 2011-06-21T09:16:47.967

1

Consider using a parser like the HTML Agility Pack and some XPath:

HtmlWeb web = new HtmlWeb();
HtmlDocument doc = web.Load("http://stackoverflow.com/questions/6422517");
var links = doc.DocumentNode.SelectNodes("//link[@rel='stylesheet']");
foreach (var node in links)
{
    Console.WriteLine(node.Attributes["href"].Value);
}

Or, to select all elements with href that ends with .css:

var links = doc.DocumentNode.DescendantNodesAndSelf()
               .Where(node => node.Attributes.Contains("href") && 
                              node.Attributes["href"].Value.EndsWith(".css"));

edited Jun 21 '11 at 09:16

answered Jun 21 '11 at 08:58

Kobi

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Couldn't get that second xpath to work on HAP, to be honest. Should be something like `//link[ends-with(@href,'css')]`. – Kobi Jun 21 '11 at 09:17

score 1 · Answer 3 · answered Jun 21 '11 at 09:15

Your Pattern

^(href)([\S]*(\.css))(\")$

^ means match the start of the string ==> NOT true in your second example

$ means match the end of the string ==> NOT true in your second example

You can just delete thos anchors from your pattern and it should match the second example.

You have a lot of unnecessary brackets in your expression. This is doing the same

href\S*\.css\"

The () brackets have the meaning that they group the content and put the matched pattern into a capturing group. I assume you don't want this, at least not the way you used them.

probably you want something like this

href=\"(\S*\.css)\"

so the hyperlink is in the capturing group 1.

The [] creates a character class, but thats not needed if you put only one item into it. So [\S] is the same than \S.

But at last I would suggest, that you have a closer look at Kobi's answer.

score 0 · Answer 4 · answered Jun 21 '11 at 08:44

0

how about this: href="([^"]*)"

answered Jun 21 '11 at 08:44

duedl0r

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score 0 · Answer 5 · answered Jun 21 '11 at 08:48

0

Try this:

href="([^"]*?\.css)"

answered Jun 21 '11 at 08:48

Kirill Polishchuk

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score 0 · Answer 6 · answered Jun 21 '11 at 09:15

0

Try:

Regex expression = new Regex("<.*href=\"(?<CSSUrl>.*css)\".*", RegexOptions.None);

With that you can get the URL with the groupname "CSSUrl".

answered Jun 21 '11 at 09:15

Steffen Schindler

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I need help for my Regex in C#

6 Answers6