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正則的話，試一下用match，其實也就是要識別到字符串 id="EaezE9)%*e^B{Olq7?Le",然后提取出引號里面的字符串

var t = `<xml xmlns="http://www.w3.org/1999/xhtml">
    <block type="variables_get" id="EaezE9)%*e^B{Olq7?Le" x="147" y="34"></block>
</xml>`;
var res = t.match(/id\s*="([^"]*)"/);
console.log(res&&res[1])

var span = document.createElement("span");
span.innerHTML = `<xml xmlns="http://www.w3.org/1999/xhtml">
    <block type="variables_get" id="EaezE9)%*e^B{Olq7?Le" x="147" y="34"></block>
</xml>`;
var block= span.getElementsByTagName('block')[0];
var id = block.getAttribute("id");

https://zhidao.baidu.com/ques...

var str='<xml xmlns="http://www.w3.org/1999/xhtml"><block type="variables_get" id="EaezE9)%*e^B{Olq7?Le" x="147" y="34"></block></xml>';
var reg = /.*id\=\"([^ \"]*).*/gi;
reg.exec(str)[1];

正則正解

(/id="([^"]*)"/)