js正则取值，如何搞？

[nitaiyoucala]

字符串如下：
var str="测试法律手段就发生 辅食剪刀<span>ffff</span><img src="data:image/png;base64,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" alt="" />f测试除了的说法<img src="/Upload/20180312101019855.jpg" border="0" />ffffffffffffffffffffldsfdfdl"
想输出如下值：
data:image/png;base64,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

[nitaiyoucala]

大神在哪里啊啊。求帮忙，谢谢

[zhongxiucheng]

变量的值先进行js编码再处理，不编码语法会有语法错误，排除语法错误后使用/"(data\:image.+?)"/m试试

[老鼠拧刀满街找猫]

var regex=/<img[^>]*src="(data:[^"]*)"/ig;
var result=[];
var match=null;
while((match=regex.exec(str))!=null){
	result.push(match[1]);
}