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<?php $text = '[a][b] [[abc][a][b]]'; echo preg_replace('~(\[\[(?:(?!\[\[|]]).|(?1))*]])(*SKIP)(*F)|\[([^][]*)]~s', '<$2>', $text);
Output for git.master, git.master_jit, rfc.property-hooks
<a><b> [[abc][a][b]]

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