Negative lookahead assertion. This is the opposite of the positive assertion; it succeeds if the contained expression doesn't match at the current position in the string.

前向否定界定符。与肯定界定符相反；当所含表达式不能在字符串当前位置匹配时成功。

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The issuing authority can then send a positive or negative authentication assertion depending upon the credentials presented by the mobile device client.

然后，发行认证机构可以根据移动设备客户机提供的凭证发送肯定或否定认证断言。

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Therefore it had to basically make a positive assertion about its constitutionality.

WHITEHOUSE: Press Briefing

Instead, Eximbank seems to be whistling past this graveyard by simply relying upon the assertion that Gazprom possesses a positive hard currency cash flow that can be accessed.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Brody Confirmation: Will Eximbank Be Allowed To Go The Way Of A Scandal-Ridden CCC?

Los Angeles is criticized for not having a defined city center, but I'd counter with the assertion that our many different "centers" are a positive.

CNN: New York vs. Los Angeles: L.A. is a 'heavenly place'