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<?php $text='this PART should be CONVERTED to uppercase [This PART should not BE changed] this part should also be CONVERTED to uppercase [THIS part should also not be CHANGED] etc..'; $text = preg_replace_callback( "/(\[(.*?)\])(*SKIP)(*FAIL)|./is", function($m) { return strtoupper($m[0]); }, $text); $text = str_replace(array('[', ']'), '', $text); echo $text;
Output for git.master, git.master_jit, rfc.property-hooks
THIS PART SHOULD BE CONVERTED TO UPPERCASE This PART should not BE changed THIS PART SHOULD ALSO BE CONVERTED TO UPPERCASE THIS part should also not be CHANGED ETC..

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