var str="hello 
world"; correctly matches the output "hello [] world"
var str="hello world"; correctly matches the output "hello [] world"
var str='hello <img src="haha.png" alt=""/>world';
let exp = /^(\S+)\s?[<].*[alt="](.*?)["]\s*[\/>]\s*(\S+)$/;
let ret = str.match(exp);
str = ret[1]+'['+ret[2]+']'+ret[3];
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