I've got a bunch of text which can contain custom tags in this format:

[MYLINK ID="1234" URL="http://mywebsite.com" TEXT="Website link"]

The text can contain multiple links. What I'm trying to do is to translate the tags to normal html links and grab the IDs in C# code. The resulting replaced tag should be in this format:

<a href="http://mywebsite.com?id=1234">Website link</a>

So to clarify, if I had the following chunk of text:

This is a test [MYLINK ID="1234" URL="http://mywebsite.com" TEXT="website link"] with some more text and [MYLINK ID="2345" URL="http://mywebsite2.com" TEXT="another link"] here too.

It should translate to this:

This is a test <a href="http://mywebsite.com?id=1234">website link</a> with some more text and <a href="http://mywebsite2.com?id=2345">another link</a> here too.

EDIT: Been faffing with Regex for the last couple of hours and have managed to get the following to match the tag but don't know what to do next...

\[MYLINK ID=\"(.*?)\" URL=\"(.*?)\" TEXT=\"(.*?)\"\]

Any help would be greatly appreciated. Cheers,

CodePudding user response：

If the attributes always in the order you showed, you can use

var text = "[MYLINK ID=\"1234\" URL=\"http://mywebsite.com\" TEXT=\"Website link\"]";
var pattern = "\\[MYLINK\\s ID=\"([^\"]*)\"\\s URL=\"([^\"]*)\"\\s TEXT=\"([^\"]*)\"]";
var replacement = "<a href=\"$2?id=$1\">$3</a>";
var result = Regex.Replace(text, pattern, replacement, RegexOptions.IgnoreCase);
// => <a href="http://mywebsite.com?id=1234">Website link</a>

See the $3" rel="nofollow noreferrer">.NET regex demo and the C# demo.

Details:

• \[MYLINK - [MYLINK text
• \s - any one or more whitespaces
• ID=\" - ID=" text
• ([^\"]*) - Group 1 ($1): zero or more chars other than "
• \"\s URL=\" - ", one or more whitespaces, URL=" text
• ([^\"]*) - Group 2 ($2): zero or more chars other than "
• \"\s TEXT=\" - ", one or more whitespaces, TEXT=" text
• ([^\"]*) - Group 3 ($3): zero or more chars other than "
• \"] - "] text.

CodePudding user response：

Thanks - I literally just got it as you were posting, doing something very similar...

string pattern = @"\[MYLINK ID=\""(.*?)\"" URL=\""(.*?)\"" TEXT=\""(.*?)\""\]";
text = Regex.Replace(text, pattern, x => $"<a href='{x.Groups[2].Value}?id={x.Groups[1].Value}'>{x.Groups[3].Value}</a>");