Regular expression to ignore white space from html tag content

Question

I have a string which contains a link that looks like this:

string source = "<img src='ftp://c//hafiz hussain//appdata//images//image.bmp' />"

I used the following regex to remove the src content:

string regexSrc = @"<img[^>]*?src\s*=\s*[""']?([^'"" >]+?)[ '""][^>]*?>";
MatchCollection matchesImgSrc = Regex.Matches(source , regexSrc, RegexOptions.IgnoreCase | RegexOptions.Singleline);

This is working fine, only if the folder name has no spaces. For the above case the matchesImgSrc[1].Groups[1].Value matches only till 'ftp://c//hafiz'

Content after the whitespace is ignored.

remove th space from the char class. And it's better to use an html parser. — Avinash Raj
– Avinash Raj, Commented May 14, 2015 at 10:03

vks · Accepted Answer · 2015-05-14 10:03:15Z

1

<img[^>]*?src\s*=\s*[""']?([^'"">]+?)['""][^>]*?>

You can try this.See demo.

https://regex101.com/r/mT0iE7/22

answered May 14, 2015 at 10:03

vks

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Wiktor Stribiżew · Accepted Answer · 2015-05-14 11:25:30Z

1

As I can see you have an XML-compliant HTML. Thus, I'd suggest using XElement to do that task.

var source = "<img src='ftp://c//hafiz hussain//appdata//images//image.bmp' />";
var elt2 = XElement.Parse(source);
var imgs = elt2.DescendantsAndSelf("img");
foreach (var im in imgs)
{
    var att = im.Attributes().Where(p => p.Name.LocalName.ToLower() == "src");
    if (att != null)
    {
       im.SetAttributeValue("src", string.Empty);
    }
}
// Converting back to string to see the result
var resst = elt2.ToString();

Output:

enter image description here

A regex solution can be used as a fallback:

var source = "<img src='ftp://c//hafiz hussain//appdata//images//image.bmp' />";
var regexSrc = @"(?<=<img[^>]*?)src\s*=\s*[""']?([^'"">]+)[ '""](?=[^>]*?>)";
var reslt = Regex.Replace(source, regexSrc, "src=\"\"");

Output: <img src="" />

edited May 14, 2015 at 11:25

answered May 14, 2015 at 10:27

Wiktor Stribiżew

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1 Comment

Wiktor Stribiżew Over a year ago

If I were you I'd use the solution based on XElement as the main one, and the regex solution only in case of improper/invalid XML.

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