Regular Expression Replace String

I am looking for a way to replace the http in a string with https when I am doing a regex replace.  I want to leave the rest of the string alone except for the first 4 characters.  Thanks!
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Terry WoodsIT GuruCommented:
Try this:

my_string = Regex.Replace(my_string, @"http(?!s)", "https");

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Easwaran ParamasivamCommented:
When you are sure to replace all http with https you could use below one.

my_string = Regex.Replace(my_string, @"http", "https");
Terry WoodsIT GuruCommented:
@EaswaranP, that will also change https to httpss.
Easwaran ParamasivamCommented:
I do agree. Assumption is that there is no https in his text.
Try this. If your URL having https, it will leave as such. If your URL having http it will change to https.

str = Regex.Replace(str, @"\b"+"http"+@"\b", "https");
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