...任何字符;开头不容许出现横线,也就是说,从开头位置向后,不容许出现横线字符,我们可以用否定顺序环视(negative lookahead)功能解决。在本例中,它写作『(?
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zero-width negative lookahead assertion 零宽负向先行断言
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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