Javascript Form Validation – RegEx

<form method="post" action="#" onSubmit="return validate(this);" name="form">

</form>
var ck_name = /^[A-Za-z0-9 ]{3,20}$/;
var ck_email = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i 
var ck_username = /^[A-Za-z0-9_]{1,20}$/;
var ck_password =  /^[A-Za-z0-9!@#$%^&*()_]{6,20}$/;

function validate(form){
	var name = form.name.value;
	var email = form.email.value;
	var username = form.username.value;
	var password = form.password.value;
	var gender = form.gender.value;
	var errors = [];
	 
	if (!ck_name.test(name)) {
	  	errors[errors.length] = "You valid Name .";
	}
	if (!ck_email.test(email)) {
		  errors[errors.length] = "You must enter a valid email address.";
	}
	if (!ck_username.test(username)) {
	  	errors[errors.length] = "You valid UserName no special char .";
	}
	if (!ck_password.test(password)) {
	  	errors[errors.length] = "You must enter a valid Password ";
	}
	if (gender==0) {
	  	errors[errors.length] = "Select Gender";
	}
	if (errors.length > 0) {
	  	reportErrors(errors);
	  	return false;
	}
	
	return true;
}

function reportErrors(errors){
	var msg = "Please Enter Valide Data...\n";
	for (var i = 0; i<errors.length; i++) {
		var numError = i + 1;
		msg += "\n" + numError + ". " + errors[i];
	}
 	alert(msg);
}

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