php, get some code from text

how from this text get WORD开发者_如何学C and WORD2.

text tex asad t text [mycode]WORD[/mycode] tex asda [mycode]WORD2[/mycode] asdasdasd

I try using preg-match, but i fail

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$str = "text tex asad t text [mycode]WORD[/mycode] tex asda [mycode]WORD2[/mycode] asdasdasd";
preg_match_all("/\[mycode\](.*?)\[\/mycode\]/", $str, $preg);
print_r($preg);