判断是否是md5

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private static boolean isValidMessageAudio(String msg) {    int cnt = 0;    for (int i=0; i<msg.length(); ++i) {        switch (msg.charAt(i)) {            case '0': case '1': case '2': case '3': case '4':            case '5': case '6': case '7': case '8': case '9':            case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':            case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':                ++ cnt;                if (32 <= cnt) return true;                break;            case '/':                if ((i + 10) < msg.length()) {// "/storage/"                    char ch1 = msg.charAt(i+1);                    char ch2 = msg.charAt(i+8);                    if ('/' == ch2 && ('s' == ch1 || 'S' == ch1)) return true;                }            default:                cnt = 0;                break;        }    }    return false;}

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