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<?php $match = preg_replace('/(?<=^|[\x09\x20\x2D])./e', 'strtoupper("\0")', "Test test1"); var_dump($match); $match = preg_replace_callback('/(?<=^|[\x09\x20\x2D])./', function($matches) {return strtoupper($matches[0]);}, "Test test1"); var_dump($match);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/8sJAs on line 3 NULL string(10) "Test Test1"

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