How do you modify the matched string using Regex.Replace?

Question

Say I want to convert these strings:

www.myexample.com and http://www.myexample.com
into:

<a href='http://www.myexample.com'>http://www.myexample.com</a>

using Regex.Replace

I've come up with this:

Regex.Replace(string, pattern, "<a href=\"$&\">$&</a>")

My problem is that I don't know how to check if the matched string $& starts with http:// and adds it if necessary.

Any ideas?

Jerry · Accepted Answer · 2013-08-10 12:10:03Z

1

If you don't have to consider https or things like that, you could maybe use this:

Regex.Replace(string, @"(?:http://)?(.+)", "<a href=\"http://$1\">http://$1</a>")

answered Aug 10, 2013 at 12:10

Jerry

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1 Comment

If you wanted to consider the https possibility, then change the http: to https?: