JS表单数据验证的正则表达式(常用)

checkUserNameflag=false;  checkPasswordflag=false;  checkPasswordAgianflag=false;  checkEmailflag=false; // 用户名校验 function checkUserName() {  var username = $("userNeme").value;  var zz = /^[A-Za-z0-9]{6,}$/;  if (!zz.test(username)) {   $("userName_warn").innerHTML = " × 用户名不符合规范";   checkUserNameflag=false;  } else {   /*$("userName_warn").style.color='blue';   $("userName_warn").innerHTML = "√ 用户名可用";*/   showUserExist(username);   checkUserNameflag=true;  } } //重置提示 function resetWarn(){  $("userName_warn").innerHTML="";  $("email_warn").innerHTML="";  $("password_warn").innerHTML="";  $("Repassword_warn").innerHTML=""; } // 密码校验 function checkPassword() {  var password1 = $("password").value;  if (password1.length >= 6 && password1.length <= 15) {   checkPasswordflag = true;   $("password_warn").style.color='blue';   $("password_warn").innerHTML = " √ 密码可用 ";   checkAgianMiMa();  } else {   checkPasswordflag = false;   $("password_warn").innerHTML = " × 密码至少为 6 个字符 ";  } } function checkPasswordAgian() {  var password1 = $("password").value;  var password2 = $("rePassword").value;  if (password1 == password2) {   if (password1 == "") {    $("Repassword_warn").innerHTML = " × 请输入密码 ";    checkPasswordAgianflag = false;    return;   }   $("Repassword_warn").style.color='blue';   $("Repassword_warn").innerHTML = "√ 重复输入密码正确";   checkPasswordAgianflag = true;  } else {   checkPasswordAgianflag = false;   $("Repassword_warn").innerHTML = " × 两次密码输入不同 ";  } } function checkEmail(){  //对电子邮件的验证   var myreg = /^([a-zA-Z0-9]+[_|/_|/.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|/_|/.]?)*[a-zA-Z0-9]+/.[a-zA-Z]{2,3}$/;   var email=$("email").value;   if(!myreg.test(email)){    checkEmailflag=false;     $("email_warn").style.color='red';    $("email_warn").innerHTML = " × 邮箱格式不符合规范";   } else {    checkEmailflag=true;    $("email_warn").style.color='blue';    $("email_warn").innerHTML = "√ 邮箱格式正确";   } } function submitCheck(){  alert(checkUserNameflag);  if(checkUserNameflag==false || checkPasswordflag==false || checkPasswordflag==false    ||checkPasswordAgianflag==false || checkEmailflag==false){   return;  } } function $(id){  return document.getElementById(id); }