match entire string (regular expression & javascript)

GreggTB

Hello, I'm trying to perform a very simple validation of user input. I
want to verify that the user entered a six-digit string consisting
entirely of numbers. So anything from 000000 to 999999 is considered
valid. The problem that I'm having is getting the validation to work on
the entire string. In other words, 000000 is okay but 000000000000 is
also returning as a match. Here's a quick code block...I have something
along these lines....

/************************************************** **/
<html>
<body>
<INPUT name="txtNumberField" type="text" id="txtNumberField">
<INPUT onClick="fnTestNumberField()" id=Button1 type=button value="Test
Number!" name=btnTest>
<script language=javascript>
function fnTestNumberField()
{
var sNumberValue = document.getElementById("txtNumberField").value;

if (sNumberValue.match(/\A[0-9]{6}\z/))
{
alert("match");
} else {
alert("no match");
}
}
</script>
</body>
</html>
/************************************************** **/

That is failing when I enter 123456 into the textbox. Why, though? I
know I can replace...

if (sNumberValue.match(/\A[0-9]{6}\z/))

....with something like...

if (sNumberValue.length == 6 && sNumberValue.match(/[0-9]{6}/))

....or I could assign a maxlength to the input box, of course. The thing
is, I really want to know WHY the regular expression isn't responding
as I'd expect. Is there a syntax error somewhere in the code?

Any suggestions would be appreciated. Thanks!

Jul 23 '05 #1

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GreggTB wrote:

Hello, I'm trying to perform a very simple validation of user input. I
want to verify that the user entered a six-digit string consisting
entirely of numbers. So anything from 000000 to 999999 is considered
valid. The problem that I'm having is getting the validation to work on
the entire string. In other words, 000000 is okay but 000000000000 is
also returning as a match. Here's a quick code block...I have something
along these lines....

/************************************************** **/
....
if (sNumberValue.match(/\A[0-9]{6}\z/))
{
alert("match");
} else {
alert("no match");
}
}

Use ^ to match the beginning of the string and $ to match the end.
Also, \d is the same as [0-9].
/^[0-9]{6}$/ or /^\d{6}$/

Both work.

Jul 23 '05 #2

GreggTB

Excellent! I knew there had to be a way to do that but I'm (obviously)
really new to regular expressions. Thank you so much!

Jul 23 '05 #3

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