REGEX: Find links without http:// and replace

I have a string and need to find all links which do not start with http:// before them and insert a string before them. this would be for links like:

src="http://
href="http://

qwertqAsked:
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glcumminsCommented:
Is a regular expression required? Can you use:

str_replace("src=\"", "src=\"http://", $string);

You would just have to check that the 'http:// does not already exists in the string.
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qwertqAuthor Commented:
that is why i was assuming a regex would be required. you have to check to make sure that http:// does not immediately follow the href=" in the string.

also you need to understand that href=" might occur numerous times within the string. it not not just one value.
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steelseth12Commented:
$string = preg_replace("@(href=\"|src=\")(?!http:\/\/)@","REPLACE HERE",$string);
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JamesCsslCommented:
$string = preg_replace('/(href=|src=)(['"])(?!http:\/\/)([^\2]*)[\2]/','$1"http://$2"',$string);
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JamesCsslCommented:
$string = preg_replace('/(href=|src=)(['"])(?!http:\/\/)([^\2]*)[\2]/','$1"http://$3"',$string);
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