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零宽断言之负预测先行断言(?!exp)用法 #6

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BiYuqi opened this issue Jan 22, 2019 · 0 comments

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BiYuqi commented Jan 22, 2019 •

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零宽断言之负预测先行断言(?!exp)用法

聊聊正则的负预测先行断言, 断言此位置的后面不能匹配表达式exp

示例

找出如下字符串中后面不包含有px的数字

const str = '1pt 2px 3em 4px'

正则

/\d(?!px)/g

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