var str='src\\main\\webapp\\static\\ca7ecd95-aa95-4da8-b369-92b66b566958\\icon.png';
alert(str.replace(/^.*?(static.*?)$/ig, '$1'));

split('static')[1] 这样的吗？ 还是必须用正则？

str.slice(str.search(/static/));

正则应该用 static.* 就可以，下面是参考代码

const regex = /static.*/g;
const str = `src\\main\\webapp\\static\\ca7ecd95-aa95-4da8-b369-92b66b566958\\icon.png`;
let m;

while ((m = regex.exec(str)) !== null) {
    // This is necessary to avoid infinite loops with zero-width matches
    if (m.index === regex.lastIndex) {
        regex.lastIndex++;
    }
    
    // The result can be accessed through the `m`-variable.
    m.forEach((match, groupIndex) => {
        console.log(`Found match, group ${groupIndex}: ${match}`);
    });

'srcmainwebappstaticca7ecd95-aa95-4da8-b369-92b66b566958icon.png'.split('static')[1]

'src\\main\\webapp\\static\\ca7ecd95-aa95-4da8-b369-92b66b566958\\icon.png'.match(/static.*/)

// Output: 
[
  "static\\ca7ecd95-aa95-4da8-b369-92b66b566958\\icon.png"
]

这个问题的亮点：