username verification

[ravi951]

Hi all,
I have written a function for accepting name and should be atleast minimum 4 characters.
It is accepting all characters including special characters.
Now i want my function to accept only a-z0-9 and _(underscore),-(hyphen)
and .(dot)
Below is my function

function checkName(form) /* for real name verification */
{
if (form.realname.value == '')
{
alert('Error: Username cannot be blank!');
form.realname.focus();
return false;
}
else if(form.realname.value.length < 4)
{
alert("UserName should be atleast 4 characters long");
return false;
}

return true;
}

[Rohan123]

HI try this,

element=document.getelementbyid("username");

function checkname(element)
{
var alphaExp = /^[_-.a-z.A-Z0-9 ]{4,10}$/;
if(element.value.match(alphaExp))
{
return true;
}
else
{
alert("Enter a valid username");
element.focus();
return false;
}
}


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Cegonsoft | Java Training

[jamewhite86]

written a function for accepting name and should be atleast minimum 4 characters.
It is accepting all characters including special characters.
Now i want my function to accept only a-z0-9 and _(underscore),-(hyphen)
and .(dot)