What's the best way to extract HTML out of $var?

[alexus <alexus@xxxxxxxxx>]

What's the best way to extract HTML out of $var?

example of $var

$var = "<a href="http://http://stackoverflow.com/"Stack Overflow</a>"
I want

$var2 = "http://starckoverflow.com/";
example: preg_match();

what else?

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