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!
VBBRettAsked:
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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");
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Terry WoodsIT GuruCommented:
@EaswaranP, that will also change https to httpss.
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Easwaran ParamasivamCommented:
I do agree. Assumption is that there is no https in his text.
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Srihari03Commented:
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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