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零宽断言之正预测先行断言(?=exp)用法 #5

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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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零宽断言之正预测先行断言(?=exp)用法

聊聊正则的正预测先行断言, 断言自身出现的位置的后面能匹配表达式exp

示例

找出如下字符串中的规定数字后面必须有px

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

正则

/\d(?=px)/g

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