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关于js正则匹配问题

let str = '<span>我是小s</span><span class="show">s</span>' 

不匹配标签里的s和类名为show的标签内容s?
结果:只找出“我是小s”中的“s”


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str.match(/<[a-zA-Z]+.*?>([sS]*?)</[a-zA-Z]*?>/g)

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