Help with a regular expression for 0,1 or 2 decimal places

Hi,

I am trying to create a regular expression for a width of a room, the value
can be a whole integer (up to 999) with up to 2 decimal places -when it is
stored in the database mysql will pad the value accordingly.

/^[0-9]{1,3}.?[0-9]{0,2}?$/

The only problem I have found with above is that I can enter 1.

Is it possible to modify it so that I can only enter the decimal point if I
enter at least digit after it?

Also is there any difference between [0-9] and \d

Thanks for your help

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Re: Help with a regular expression for 0,1 or 2 decimal places

Shaun wrote:
> Hi,
>
> I am trying to create a regular expression for a width of a room, the value
> can be a whole integer (up to 999) with up to 2 decimal places -when it is
> stored in the database mysql will pad the value accordingly.
>
> /^[0-9]{1,3}.?[0-9]{0,2}?$/
>
> The only problem I have found with above is that I can enter 1.
>
> Is it possible to modify it so that I can only enter the decimal point if I
> enter at least digit after it?
>
> Also is there any difference between [0-9] and \d
>
> Thanks for your help

Try this..

^\d{1,3}($|\.\d{1,2}$)

1,2 or 3 digits followed by end OR decimal point and 1 or 2 digits and end of line.

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Re: Help with a regular expression for 0,

On Mon, October 24, 2005 3:59 pm, Shaun wrote:
> I am trying to create a regular expression for a width of a room, the
> value
> can be a whole integer (up to 999) with up to 2 decimal places -when
> it is
> stored in the database mysql will pad the value accordingly.
>
> /^[0-9]{1,3}.?[0-9]{0,2}?$/

Because '.' is special to preg, this expression ALSO matches:
12a25
5z43
7a

[aside]
Engineer: 7A, please.
Davey: What number, please?
Band: 7A!
Davey: All right, okay, just cuz I'm short
[/aside]

This might (or might not) do it:

/^[0-9]{1,3}(\\.[0-9]{1,2})?$/

The \\ is there so that PHP will turn it into \, and then you have \.
in the regular expression which the PRCE will interpret as "the
literal character known as 'dot'" instead of "any old character at
all"

> Also is there any difference between [0-9] and \d

Try it and see.

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Re: Help with a regular expression for 0,1 or 2 decimal places

hi,

i'm not a regex guru myself, but the following regex should work - tabke
a look at my regex test setup ...


$test = array(
"1",
"1.",
"1.2",
"1.23",
"1.234",

"1234",
"1234.",
"1234.5",
"1234.56",
"1234.567"
);


// if there's a dot, we want at least one number after it.
$regex = '/^\d+(.\d{1,2})?$/';

// test all or numbers ...
foreach ($test as $number) {
if (preg_match($regex, $number)) {
echo "ok ";
} else {
echo "no ";
}
echo $number . "
\n";
}

?>

i don't think there's a difference between \d and [0-9], but again, i am
no expert ...

regards,
phillip

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Re: Re: Help with a regular expression for 0,1 or 2 decimal places

Phillip Oertel a =E9crit :
> hi,
>
> i'm not a regex guru myself, but the following regex should work - tabke
> a look at my regex test setup ...
>
> >
> $test =3D array(
> "1",
> "1.",
> "1.2",
> "1.23",
> "1.234",
>
> "1234",
> "1234.",
> "1234.5",
> "1234.56",
> "1234.567"
> );
>
>
> // if there's a dot, we want at least one number after it.
> $regex =3D '/^\d+(.\d{1,2})?$/';

It would be better to escape the point, cause the point greps for everythin=
g.
$regex =3D '/^\d+(\.\d{1,2})?$/';
Without escaping the point, it could match for '1234:567' or something else.


> // test all or numbers ...
> foreach ($test as $number) {
> if (preg_match($regex, $number)) {
> echo "ok ";
> } else {
> echo "no ";
> }
> echo $number . "
\n";
> }
>
> ?>
>
> i don't think there's a difference between \d and [0-9], but again, i am
> no expert ...
>
> regards,
> phillip

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Re: Re: Help with a regular expression for 0,1 or 2 decimal

Phillip Oertel wrote:
> hi,
>
> i'm not a regex guru myself, but the following regex should work - tabke
> a look at my regex test setup ...
>
> >
> $test = array(
> "1",
> "1.",
> "1.2",
> "1.23",
> "1.234",
>
> "1234",
> "1234.",
> "1234.5",
> "1234.56",
> "1234.567"
> );
>
>
> // if there's a dot, we want at least one number after it.
> $regex = '/^\d+(.\d{1,2})?$/';

Escape the decimal point.
$regex = '/^\d+(\.\d{1,2})?$/';

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KegWorks.com
716.856.9675
john@kegworks.com

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