javascript/JS常用正则表达式
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javascript/JS限制用户名只能输入字母和数字下划线
function checkreg(){
var msg = "对不起,输入错误\n";
var regform = document.all.reg;
var username = regform.username;
var password1 = regform.password1;
var password2 = regform.password2;
var usern = /^[a-zA-Z0-9_]{1,}$/;
//alert(username.value);
if (!username.value.match(usern)) {
msg += "用户名只能由字母数字下划线组成\n";
alert(msg);
username.value = '';
username.focus();
return false;
}
if(password1.value != password2.value)
{
msg += '两次输入密码不一致';
alert(msg);
password1.value = '';
password2.value = '';
password1.focus();
return false;
}
function checkreg(){