Check if input number is valid in Codeigniter Form Validation

Question

Can you help me to validate if my input number is valid.

It can be a whole number It can also be a decimal number but interval is 0.5, So 0.5, 1.5 , 2.5 is ok but .2,1.3,2.6 is not valid.

if ((preg_match('/^\d+\.\d+$/',$bkpoints))  || (preg_match('/^\.\d+$/',$bkpoints)))
{       {
    if ($bkpoints % 0.5 !== 0)
    {
          $this->form_validation->set_message('is_bk_decimal','Bk points decimal value should be incremented by 0.5');
          return false;
    }

 }
 return true;

HamZa · Accepted Answer · 2013-07-01 09:08:46Z

2

You can validate it with one single regex ^\d+(?:\.[05]0*)?$ :

if(preg_match('#^\d+(?:\.[05]0*)?$#', $bkpoints)){
    echo 'valid';
}

Explanation:

^ : begin of line
\d+ : match a digit one or more times
(?: : start of non-capturing group
- \. : match a dot
- [05] : match 0 or 5
- 0 : match 0 zero or more times
): End of non-capturing group
? : make the group optional
$ : end of line

online regex demo

answered Jul 1, 2013 at 9:08

HamZa

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4 Comments

user2046410 Over a year ago

Thanks much, Actually We are almost there but when I input 0.5 it also gave invalid. 0.5 should also be accepted

HamZa Over a year ago

@user2046410 impossibruuuu regex demo | php demo. Make sure you don't have spaces etc...

user2046410 Over a year ago

I edit it like this if((preg_match('#^\d+(?:\.[05]0*)?$#', $bkpoints)) || (preg_match('#^(?:\.[05]0*)?$#', $bkpoints))){ and it works fine for. Thank you very much for the idea HamZa

HamZa Over a year ago

@user2046410 You could wrap everything in one single regex ^\d+(?:\.[05]0*)?$|^(?:\.[05]0*)$ demo. What you have will even match empty strings.

Daniel Gelling · Accepted Answer · 2013-07-01 08:37:46Z

0

Try the is_numeric() function in PHP: http://php.net/manual/en/function.is-numeric.php

It'd return true if the number is an valid number, and return false if it isn't.

answered Jul 1, 2013 at 8:37

Daniel Gelling

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2 Comments

user2046410 Over a year ago

ah yes but it will not check if its interval of 0.5

Daniel Gelling Over a year ago

I'm sorry, check my other answer below ;)

Daniel Gelling · Accepted Answer · 2013-07-01 08:45:28Z

-1

Or you could also use the ereg() function:

if(ereg("^([0-9]+|[0-9]{1,3}(,[0-9]{3})*)(.[0-9]{1,2})?$", "0.9")){
  echo "number";
}else{
  echo "not a number";
}

answered Jul 1, 2013 at 8:45

Daniel Gelling

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1 Comment

Elias Van Ootegem Over a year ago

Update your existing answer, don't post a second one... also: ereg is DEPRECATED, use preg_match instead. Lastly: regular expressions to check if a value is a float is just total overkill

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