var s = "大学老师_event";
var r = s.match(/^\[_event]+/); //s.match(/^([^\d]+)([\d]+)([^\d]+.+)$/);
if(r) alert(r[0]);
else alert("nothing");
var r = s.match(/^\[_event]+/); //s.match(/^([^\d]+)([\d]+)([^\d]+.+)$/);
if(r) alert(r[0]);
else alert("nothing");
s = "xxxx_event";
s2 = "xxxx222211_event";
s3 = "xxxx222211event_event";
//xxxx不固定长度
var re=/(.*?)_event$/
alert(s.replace(re,"$1"))
alert(s2.replace(re,"$1"))
alert(s3.replace(re,"$1"))</script>
var s = "xxxx_event";
var ary=s.split("_");
alert(ary[0]);
</script>
var str2=s.substr(0,s.length-6)
document.write(str2)