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run code in 500+ PHP versions simultaneously
<?php $html = <<<HTML <img src="docs/relative/url/img.jpg" /> <img src="/docs/relative/url/img.jpg" /> <img src="https://docs/relative/url/img.jpg" /> <img src="http://docs/relative/url/img.jpg" /> HTML; $base = 'https://example.com/'; echo preg_replace( '~ src="(?!http)\K/?~', $base, $html );
Output for rfc.property-hooks, git.master, git.master_jit
<img src="https://example.com/docs/relative/url/img.jpg" /> <img src="https://example.com/docs/relative/url/img.jpg" /> <img src="https://docs/relative/url/img.jpg" /> <img src="http://docs/relative/url/img.jpg" />

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