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Check every character in all text boxes onSubmit

Hi there,

I have one question, how can we onSubmit form action check all fields values if they contain a specific charatcer (in regardless what is the field name or how many fields, they might be only a text box).

Lets say i want to raise an alert and stop the form from being submited if on of the text boxes have the character '~' or '`' or '|' etc..

I managed to make a function to check while the user is typing, but they can copy any text from a notepad then paste it in the text box! So because of this I want to make another check onSubmit.

Thanks in advance

Code:

<form name="myform" ..... onsubmit="validate();">

function validate()
{
if(!illegal_chars())//validate all the fields....if okay, submit
{
document.forms["myform"].submit();
}
else
{
alert("Wrong!!!!");
}
}

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