I'm looking for a way to look for a specific string within a page in the visible text and then wrap that string in <em> tags. I have tried used HTML Agility Pack and had some success with a Regex.Replace but if the string is included within a url it also gets replaced which I do not want, if it's within an image name, it gets replaced and this obviously breaks the link or image url.
An example attempt:
var markup = Encoding.UTF8.GetString(buffer);
var replaced = Regex.Replace(markup, "product-xs", " <em>product</em>-xs", RegexOptions.IgnoreCase);
var output = Encoding.UTF8.GetBytes(replaced);
_stream.Write(output, 0, output.Length);
This does not work as it would replace a <a href="product/product-xs"> with <a href="product/<em>product</em>-xs"> - which I don't want.
The string is coming from a text string value within a CMS so the user can't wrap the words there and ideally, I want to catch all instances of the word that are already published.
Ideally I would want to exclude <title> tags, <img> tags and <a> tags, everything else should get the wrapped tag.
Before I used the HTML Agility Pack, a fellow front end dev tried it with JavaScript but that had an unexpected impact on dropdown menus.
If you need any more info, just ask.
You can use HTML Agility Pack to select only the text nodes (i.e. the text that exists between any two tags) with a bit of XPath and modify them like this.
Looking only in body will exclude <title>, <meta> etc. The not excludes script tags, you can exclude others in the same way (or check the parent node in the loop).
foreach (HtmlNode node in htmlDoc.DocumentNode.SelectNodes("//body//*[not(self::script)]/text()"))
{
var newNode = htmlDoc.CreateTextNode(node.InnerText.Replace("product-xs", "<em>product</em>-xs"));
node.ParentNode.ReplaceChild(newNode, node);
}
I've used a simple replace, regex will work fine too, prob best to check the performance of each approach and choose which works best for your use case.