去掉字符串前后所有空格的正则表达式

/去掉字符串前后所有空格/
function trim(str){ 
return str.replace(/(^\s)|(\s$)/g, ""); 
} 
//计算标题长度
function getNickNameLength(){
var title = $("#title").val();
var len = 0;
for (var i = 0; i < title.length; i++) {
var a = title.charAt(i);
if (a.match(/[^\x00-\xff]/ig) != null){
len += 2;
}else{
len += 1;
}
}
return len;
} 
//验证活动标题
function vailTitle(){
//var title = $("#title").val();
var title =trim($("#title").val());
var flag = false;
var message = "";
var length = getNickNameLength();
if(title == ''){
message = "标题不能为空！";
}else if(length>20){
message = "标题为20个字符内！";
}else{
flag = true;
}
if(!flag){
$("#lr1").html(message);
}else{
$("#lr1").html("");
}
return flag;
}
//光标离开的时候校验
$("#title").blur(function(){
vailTitle();
});
//获得焦点的时候隐藏
/ $("#title").on('keyup',function(e){
$("#lr1").html("").hide();
}); /
$("#title").focus(function(){
$("#lr1").html("");
});

-split $a

$a -split '\s+'
$a -replace ("\s+","`n")

[regex]::split($a,"\b\s+\b")

[regex]::replace($a,"\b\s+\b"," ").split(" ")

[regex]::matches($a,"\b\S+\b") | %{$_.value}