... 边界(Boundary) 肯定顺序环视(Positive Lookahead) 否定顺序环视(Negative Lookahead) ...
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positive lookahead
积极的超前
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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