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<?php $keywords = preg_split("~(?<!=|^)(?=https?://)~", "http://foo.barhttps://foo.bazhttp://foo.bar?url=http://foo.baz"); print_r($keywords); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => http://foo.bar [1] => https://foo.baz [2] => http://foo.bar?url=http://foo.baz )

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