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var str = "我....(231)png(109.02KB)",
reg = /\b\([\s\S]*\)$/;
alert(str.match(reg));
var re = /^(?:.+)(?:\(|()(.+)(?:\)|))$/gi;
var str = '我....png(109.02KB)';
var ret = re.exec(str);
if(ret!=null&&ret.length == 2)
{
alert(ret[1]);
}else{
alert("no");
}
<script>
var str = "abbcc(abcd)cdeb(109.02KB)";
var pa = /.*\((.*)\)/;
alert(str.match(pa)[1]);
</script>
var str = "1-我的文件夹(我....png(109.02KB)";
/\(([^\(\)]*)\)[^\(\)]*$/.exec(str);
var result = RegExp.$1;
alert(result);
var str = "1-我的文件夹(我....png(109.02KB)";
/\([^\(\)]*\)[^\(\)]*$/.exec(str);
var result = RegExp.$1;
alert(result);