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<?php $pattern = "/\[([^][|]+)(?:\|([^][]+))?\]/"; $s = "This is an example definition. Here is a link to [foo]. This is an [aliased link|bar]."; $s = preg_replace_callback($pattern, function($match){ $template = '<a href="%s">%s</a>'; return sprintf($template, array_key_exists(2, $match) ? $match[2] : $match[1], $match[1]); }, $s); echo $s;
Output for git.master, git.master_jit, rfc.property-hooks
This is an example definition. Here is a link to <a href="foo">foo</a>. This is an <a href="bar">aliased link</a>.

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