span style=color rgb51 51 51;与负相关与正相关spanspan data-w-e-type=formula data-w-e-is-void data-w-e-is-inline data-value=AAAAspanspan data-w-e-type=formula data-w-e-is-void data-w-e-is-inline data-value=bbb

你可以使用JavaScript的正则表达式来提取这段字符串中含有data-value的span。以下是一个示例代码：

var str = '<span style="color: rgb(51, 51, 51);">与负相关，与正相关</span><span data-w-e-type="formula" data-w-e-is-void data-w-e-is-inline data-value="AAAA"></span><span data-w-e-type="formula" data-w-e-is-void data-w-e-is-inline data-value="bbb"></span>';

var regex = /<span[^>]*data-value="([^"]*)"[^>]*>/g;
var matches = str.match(regex);

for (var i = 0; i < matches.length; i++) {
  var match = matches[i];
  // 在这里处理匹配到的span
  console.log(match);
}

这段代码会将匹配到的含有data-value的span标签打印出来。你可以根据需要进行进一步处理