Regular expression to replace image tag src attribute value

Question

I have a string that contains html code of a document.

It can have multiple image tags inside.

What I want to do is to pass the img tag's src attribute value i.e. url to a C# function and replace that value with the function returns.

How can I do this?

If you could post what you tried so far, it might be easier to understand. — Anirudh Ramanathan
– Anirudh Ramanathan, Commented Oct 30, 2012 at 13:39
Check this question: stackoverflow.com/questions/4257359/… — UnitStack
– UnitStack, Commented Oct 30, 2012 at 13:44

Anirudha · Accepted Answer · 2016-01-24 04:02:00Z

3

Regex is not a good for parsing HTML files.HTML is not strict nor is it regular with its format.(for example: in non strict html its OK to have a tag without a closing tag)

Use htmlagilitypack

You can use htmlagilitypack to do it like this

HtmlDocument doc = new HtmlDocument();
doc.Load(yourStream);

foreach(var item in doc.DocumentNode.SelectNodes("//img[@src]"))//select only those img that have a src attribute..ahh not required to do [@src] i guess
{
 item.Attributes["src"].Value=yourFunction(item.Attributes["src"].Value);
}
doc.Save("yourFile");//dont forget to save

edited Jan 24, 2016 at 4:02

answered Oct 30, 2012 at 13:58

Anirudha

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2 Comments

Dev Over a year ago

I am passing HTML in string and I want to return that string with replaced values. I don't want to save it in file. How do I do it?

Anirudha Over a year ago

@DevendraGohil use doc.DocumentNode.OuterHtml to get the full html

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