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<?php $str = "<b>ayat</b><br /><b>ollah</b>"; echo $str; $str = preg_replace( "/</u", "/ </u", $str ); echo $str; ?>
Output for git.master, git.master_jit, rfc.property-hooks
<b>ayat</b><br /><b>ollah</b>/ </ub>ayat/ </u/b>/ </ubr />/ </ub>ollah/ </u/b>

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