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需求： var str="<a href='@sfzh'>129903232</a><a href='@sfzfh'>49903232</a>"
将字符串中的@***替换为其后面的数字
解决：str.replace(/<a href='(.+?)'>(.*?)<\/a>/g,"<a href='$2'>$2<\/a>")
结果："<a href='129903232'>129903232</a><a href='49903232'>49903232</a>"
说明：/<a href='(.+?)'>(._?)</a>/g;将替换项做成捕获组（加括号的部分），同时注意在_|+添加？实现非贪婪匹配，最后采用$2完成捕获组项的替换
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