vb.org Archive - Simple regex question

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Lionel

01-04-2006 12:50 AM

Simple regex question

I am getting a $value from a $_POST['value'] from a textbox

How can I make sure that only "digits" and "spaces" are allowed, and nothing else?

eg 55 32 etc...

but no 55-32 or abcd or [ or * or etc...

harmor19

01-04-2006 12:20 PM

PHP Code:


		
			
if(!is_numeric($_POST['value']))

{

  die('Only numerical values');

}

I don't know if it'll allow spaces

Code Monkey

01-04-2006 03:14 PM

That will die on spaces. This should work.

PHP Code:


		
			
$test_one = '1 23465';

if(preg_match('#[^0-9\s]#',$test_one))
{
    $result = 'Ahah! Found an evil character.';
}
else
{
    $result = 'Only Digits and Spaces here!';
}

echo $result;

You you need to check multiple items use it as a function.

PHP Code:


		
			
$test_one = '1 23465';

if(digitsOnly($test_one))
{
    $result = 'Ahah! Found an evil character.';
}
else
{
    $result = 'Only Digits and Spaces here!';
}

echo $result;

function digitsOnly($target)
{
    return preg_match('#[^0-9\s]#', $target);
}

Lionel

01-04-2006 03:42 PM

Both methods stop valid and invalid characters.

Code Monkey

01-04-2006 05:00 PM

Not according to your original post. Is there something else you were trying to block. The regex above should return false for digits and spaces only, true for anything else.

filburt1

01-04-2006 07:33 PM

PHP Code:


		
			
if (preg_match("/^[0-9\w]+$/siU", $subject))

{

    // valid

}

PHP Code:


		
			
function validate($subject)

{

    for ($i = 0; $i < strlen($subject); $i++)

    {

        if (!is_numeric($subject{$i}) or $subject{$i} != " ")

        {

            return false;

        }

    }

    return true;

}

Code Monkey

01-04-2006 09:04 PM

Quote:

Originally Posted by filburt1

PHP Code:


		
			
if (preg_match("/^[0-9\w]+$/siU", $subject))
{
    // valid
}

PHP Code:


		
			
function validate($subject)
{
    for ($i = 0; $i < strlen($subject); $i++)
    {
        if (!is_numeric($subject{$i}) or $subject{$i} != " ")
        {
            return false;
        }
    }
    return true;
}

Not working for me.

The c wrapper ctype_digit() is much faster than is_numeric if your going to go that way about it.

Code:

^0-9\s //Anything that does not "^" have the value of a digit "0-9" or a space "\s".

^\d\s works also and might be a bit faster

Run this test on your server Lionel. It works for every combo I have tried.

PHP Code:


		
			
$test = array(
    '55 32',
    '123b4',
    '4-55',
    '9543',
    '*/12-b',
    '&f54gt',
    '[1234]',
    '12 3',
    'end'
);

for($i = 0; $i < 9; $i++)
{
    echo digitsOnly($test[$i]) . '<br />';
}



function digitsOnly($target)
{
    if(preg_match('#[^\d\s]#', $target))
    {
        return 'Ahah! Found an evil character in <b>' . $target . '</b>';
    }
    else
    {
        return 'Only Digits and Spaces here! in <b>' . $target . '</b>';
    }
}

Lionel

01-06-2006 11:58 PM

I finally got it to work by exploding the values in the array and extracting them individually.

PHP Code:


		
			
 if (!empty($_POST['predminutes1'])){
$count1 = 0;
foreach($_POST['predminutes1'] as $mkey1=>$gvalue1) {
$gsub1 = explode(' ', $gvalue1);
foreach($gsub1 as $gnumber1) {
     # check value to add to count
     if(!empty($gnumber1))
        $count1++; 
if ($count1 > $predscore1) {
    eval(print_standard_error('error_invalidscorers'));
}
if (!preg_match('/^([0-9]*)$/', $gnumber1)){
    eval(print_standard_error('error_invalidcharacters'));
}
}
}
}

akanevsky

01-07-2006 01:25 AM

PHP Code:


		
			
if (preg_match("#^[\d\s]*$#", $subject))

{

    // valid

}

Code Monkey

01-07-2006 01:31 AM

Quote:

Originally Posted by Lionel

I finally got it to work by exploding the values in the array and extracting them individually.

PHP Code:


		
			
 if (!empty($_POST['predminutes1'])){
$count1 = 0;
foreach($_POST['predminutes1'] as $mkey1=>$gvalue1) {
$gsub1 = explode(' ', $gvalue1);
foreach($gsub1 as $gnumber1) {
     # check value to add to count
     if(!empty($gnumber1))
        $count1++; 
if ($count1 > $predscore1) {
    eval(print_standard_error('error_invalidscorers'));
}
if (!preg_match('/^([0-9]*)$/', $gnumber1)){
    eval(print_standard_error('error_invalidcharacters'));
}
}
}
}

That's a lot of code to do a simple task.

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