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<?php $content = '<iframe class="vine-embed" src="https://vine.co/v/Mlr5Kt22TKA/embed/simple" width="600" height="600" frameborder="0"></iframe><script async src="//platform.vine.co/static/scripts/embed.js" charset="utf-8"></script>'; preg_match('#(?<=vine.co/v/)([0-9A-Za-z])+#', $content, $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(11) "Mlr5Kt22TKA" [1]=> string(1) "A" }

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