Regular Expression to get img tag where src contains text

user_15802016 0
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Using VB.net, I have a string that contains HTML. The HTML has several img tags within it. I am trying to grab an entire particular img tag based on the src containing specific characters (image002) so that I can replace the entire image tag with some new code.

What I have so far:

dim bodyContent as string = "<html><body><img src='image001.png'/><img src='image002.png'/></body></html>"
dim searchStr as string = "image002"

Dim imgRegex As New Regex("@""<img.*?src=""(?" & searchStr & ".*?)"".*?>""", RegexOptions.IgnoreCase)
bodyContent = imgRegex.Replace(bodyContent, "<div class='newCode'><a href='https://mywebsite.net/ViewAttachment'><img src='https://mywebsite.net/ViewThumbnail'></a></div>")

However, my RegEx is not correct. Any advice on to get the correct RegEx?

vb.net html regex
1 Answers

You can use

Dim imgRegex As New Regex("<img[^>]+" & searchStr & "[^>]*>", RegexOptions.IgnoreCase)

The regex matches

  • <img - <img string
  • [^>]+ - one or more chars other than >
  • & searchStr & - the literal text inside searchStr (note it works here like that because the variable only contains word chars, in a generic case, you need to escape it using Regex.Escape(searchStr))
  • [^>]*> - zero or more chars other than > and then a > char.

Full VB.NET demo:

Dim bodyContent as string = "<html><body><img src='image001.png'/><img src='image002.png'/></body></html>"
Dim searchStr as string = "image002"
Dim imgRegex As New Regex("<img[^>]+" & searchStr & "[^>]*>", RegexOptions.IgnoreCase)
bodyContent = imgRegex.Replace(bodyContent, "<div class='newCode'><a href='https://mywebsite.net/ViewAttachment'><img src='https://mywebsite.net/ViewThumbnail'></a></div>")
Console.Write(bodyContent)

Output:

<html><body><img src='image001.png'/><div class='newCode'><a href='https://mywebsite.net/ViewAttachment'><img src='https://mywebsite.net/ViewThumbnail'></a></div></body></html>
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