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<?php $line = 'You know this brother has knowledge of brotherhood.'; $pattern = '~\b(Know|brother)\b~i'; $output = preg_replace($pattern, '<b>$1</b>', $line); var_dump(trim($output));
Output for git.master, git.master_jit, rfc.property-hooks
string(65) "You <b>know</b> this <b>brother</b> has knowledge of brotherhood."

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