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Form validation and regular expressions

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Oct 31.2006

Hello
I have one problem in form validation using java scripts and regular expressions. I want to have a regulation that if the password contains more than 3 similar characters, it returns an error on indicating the weakness of the password.
The part of the java script concerned is as follow:

re = /.{0,3}/;
if(re.test(myForm.npassword.value)){
alert(“Error: The password can not contain more than 3 similar characters.”);
return false;
}

But it doesn’t work , any comment plz?

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JavaScript

3 Comments(s) ↴

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@A1ien51Oct 31.2006 — Um, . means any character except new line so that means abc aaa cda would all test true. You probably also want to use match and charAt()

Eric
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@semi-sentientOct 31.2006 — If you want to discount case-sensitivity, then convert the string to lower case. The following regex will return true if the user inputs "aaa" and "AAA" (or any other letter of the alphabet):

<script language="javascript" type="text/javascript">
// will fail because of the "fff"
var pwString = "Aaa@@1.222bce-fff";

if (pwString.match(/([a-zA-Z])11/)) {
alert("Your password can not contain 3 or more consecutive identical characters.");
}
</script>
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@azadehauthorOct 31.2006 — Thanks .I used the regular expression u gave me and it works perfectly
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