Regular Expression block negation

I want to find out a string in which a particular tag does not occur, such as:

<xyz>[w]+<[^(unwanted)]></xyz>

where unwanted will be interpreted as a , d , e , n , t and u . But what I want is a block string. How can I express it in regular expression? I have tried negative lookahead, which doesn't work:

<xyz>.+(?!unwanted).+</xyz>

---

<xyz>(?:(?!unwanted).)+</xyz>

匹配<xyz>...</xyz>所有字符，但只限于unwanted的表达式不在任何字符处开始。

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