By using this site, you agree to our updated Privacy Policy and our Terms of Use. Manage your Cookies Settings.
437,567 Members | 1,185 Online
Bytes IT Community
+ Ask a Question
Need help? Post your question and get tips & solutions from a community of 437,567 IT Pros & Developers. It's quick & easy.

a problem with text field verification

P: n/a
I have to write a program to verify text field in HTML forms.
So,I hane to verify a text field with lenth 10 & maxlenth 10.The
entered text should be as follows.
xxxxxxxxxy
where xxxxxxxxx denotes a combination of numbers and y should be one
of 'X','x','V'or 'v'.Also inputs such as 000000000v,000000000X are not
possible.
Jul 20 '05 #1
Share this Question
Share on Google+
8 Replies


P: n/a
In article <6d**************************@posting.google.com >, dm***@mail.com
(gunawardana) writes:
I have to write a program to verify text field in HTML forms.
So,I hane to verify a text field with lenth 10 & maxlenth 10.The
entered text should be as follows.
xxxxxxxxxy
where xxxxxxxxx denotes a combination of numbers and y should be one
of 'X','x','V'or 'v'.Also inputs such as 000000000v,000000000X are not
possible.


Try reading your schoolbook and doing your own homework?
--
Randy
Jul 20 '05 #2

P: n/a
Hello,

Validate the string as:

str="012345678x";
var pat = new RegExp(/[0-9]{9}[xv]/i);
if (pat.exec(str)==null)
alert('Invalid input!');

--
Elias

"gunawardana" <dm***@mail.com> wrote in message
news:6d**************************@posting.google.c om...
I have to write a program to verify text field in HTML forms.
So,I hane to verify a text field with lenth 10 & maxlenth 10.The
entered text should be as follows.
xxxxxxxxxy
where xxxxxxxxx denotes a combination of numbers and y should be one
of 'X','x','V'or 'v'.Also inputs such as 000000000v,000000000X are not
possible.

Jul 20 '05 #3

P: n/a
"gunawardana" <dm***@mail.com> wrote in message
news:6d**************************@posting.google.c om...
I have to write a program to verify text field in HTML forms.
So,I hane to verify a text field with lenth 10 & maxlenth 10.The
entered text should be as follows.
xxxxxxxxxy
where xxxxxxxxx denotes a combination of numbers and y should be one
of 'X','x','V'or 'v'.Also inputs such as 000000000v,000000000X are not
possible.

I'm sure there's a Regular expression that does what you want with less
coding but here's one solution; watch for word-wrap.
<html>
<head>
<title>gunawardana.htm</title>
<script language="javascript" type="text/javascript">
<!--
function check() {
var form = document.forms[0];
var data = form.Data.value;
if (data.length != 10) return;
if (data.substr(0,9) == "000000000") return;
for (var i=0; i<9; i++) {
if (data.charAt(i) < "0" || data.charAt(i) > "9") return;
}
if ("XxVv".indexOf(data.charAt(9)) < 0) return;
alert("OK!");
}
//-->
</script>
</head>
<body>
<form>
<input type="text" name="Data" size="10" maxlength="10">
<input type="button" value="Check" onclick="check()">
</form>
</body>
</html>
Jul 20 '05 #4

P: n/a
JRS: In article <6d**************************@posting.google.com >, seen
in news:comp.lang.javascript, gunawardana <dm***@mail.com> posted at
Mon, 22 Dec 2003 20:32:27 :-
I have to write a program to verify text field in HTML forms.
So,I hane to verify a text field with lenth 10 & maxlenth 10.The
entered text should be as follows.
xxxxxxxxxy
where xxxxxxxxx denotes a combination of numbers and y should be one
of 'X','x','V'or 'v'.Also inputs such as 000000000v,000000000X are not
possible.


But what do you mean by "such as"? With leading zero? With all zeroes?

There is an "or" facility in a RegExp, but not AFAIK an equivalent
"and".

Don't use a RegExp; use two, the second to deal with whatever "such as"
means.

OK = /^\d{9}(v|x)$/i.test(S) && /[1-9]/.test(S) // not 000000000
OK = /^\[1-9]d{8}(v|x)$/i.test(S) // not leading zero

See in <URL:http://www.merlyn.demon.co.uk/js-valid.htm>.

--
John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 IE 4
<URL:http://jibbering.com/faq/> Jim Ley's FAQ for news:comp.lang.javascript
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.
Jul 20 '05 #5

P: n/a
Dr John Stockton <sp**@merlyn.demon.co.uk> writes:
There is an "or" facility in a RegExp, but not AFAIK an equivalent
"and".
Not directly. There could be, since there is nothing in the technology
used that prohibits and "and" (and regular languages are closed under
intersection).
The closest you get is positive lookahead, i.e., to match five digits
and at least one 4, you can write
/^(?=\d{5})\d*4\d*$/
Don't use a RegExp; use two,


Agreed. Often, a very complex regular expressin can be written as
two simple ones.

Example: String contains n "a"'s and m "b"'s:

Two regexps:
/^[^a]*(a[^a]*){n}$/
/^[^b]*(b[^b]*){m}$/

I won't even begin to write a regexp for n and m with values much over 2.
Try :)

/L
--
Lasse Reichstein Nielsen - lr*@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleDOM.html>
'Faith without judgement merely degrades the spirit divine.'
Jul 20 '05 #6

P: n/a
Lasse Reichstein Nielsen <lr*@hotpop.com> wrote in
news:1x**********@hotpop.com:
Dr John Stockton <sp**@merlyn.demon.co.uk> writes:
There is an "or" facility in a RegExp, but not AFAIK an equivalent
"and".


Not directly. There could be, since there is nothing in the technology
used that prohibits and "and" (and regular languages are closed under
intersection).
The closest you get is positive lookahead, i.e., to match five digits
and at least one 4, you can write
/^(?=\d{5})\d*4\d*$/


Actually you can use positive lookahead to implement an arbitrary "and":
/^(?=.*this)(?=.*that)/ (a trick introduced in the _Perl Cookbook_ and
implemented in a Perl module of mine).

However, doing two separate tests will usually be more efficient and the
lookahead trick should probably be used only when the match parameters
aren't known until runtime.
Jul 20 '05 #7

P: n/a
Eric Bohlman <eb******@earthlink.net> writes:
Actually you can use positive lookahead to implement an arbitrary "and":
/^(?=.*this)(?=.*that)/ (a trick introduced in the _Perl Cookbook_ and
implemented in a Perl module of mine).


The problem is that you can only do this efficiently at the end of a string.
Compare this for "or':
/z(aa|bbb)cd/
If we had the hypothetical & operator, and wrote
/z(.*this.*&.*that.*)cd/
then we wanted the part between "z" and "cd" to contain both "this"
and "that".

If you do that with lookahead, you need to be able to bound the search
somehow, or the lookahead can test past the cd. As your example:
/z(?=.*this)(.*that.*)cd/
would incorrectly match
"z that cd this"

You need to ensure that the lookahead is only tested against the same
string as the other argument to "and".
You can do "the trick" and duplicate the continuation:
/z(?=.*this.*cd)(.*that.*cd)/
but even that can be broken by using more complex expressions. Take
"all digits, and at least three 4's":

/z(\d*&(.*4){3}.*)cd/
Doing the trick here gives
/z(?=\d*cd)(.*4){3}.*cd/
However, that also matches
"z111cd444cd"

Again, you have to build your RegExps so the lookahead is bounded,
something that was not necessary with the hypothetical "&" operator.
/L
--
Lasse Reichstein Nielsen - lr*@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleDOM.html>
'Faith without judgement merely degrades the spirit divine.'
Jul 20 '05 #8

P: n/a
lallous wrote:
str="012345678x";
var pat = new RegExp(/[0-9]{9}[xv]/i);
No. Either

var pat = /\d{9}[xv]/i;

or

var pat = new RegExp("\\d{9}[xv]", "i");
if (pat.exec(str)==null)
if (! pat.test(str))
alert('Invalid input!');

[Top post]


Please do not do this, you are wasting
scarce and thus precious resources.
PointedEars
Jul 20 '05 #9

This discussion thread is closed

Replies have been disabled for this discussion.