Php Sanitize and Validate form with some character exceptions

Question

I'm using in Php Sanitize and Validate Filters but I have problems to add some rules, I have some basic knowledge of php so I think this question is easy for you.

if ($_POST['ccp_n'] != "") {
            $ccp = filter_var($_POST['ccp_n'], FILTER_SANITIZE_NUMBER_INT);
            if (!filter_var($ccp, FILTER_VALIDATE_INT)) {
                $errors .= 'Insert a valid code.<br/>';
            }
        } else {
            $errors .= 'Insert a code.<br/>';
        }

I need to add a minimum and maximum number of characters (14-15) and I want to accept this characters ( - or space ) .The exact sequence is 0000-0000-0000 (the last four digits could be 5 too

Thanks

"Something like" is a bit vague. Define the variable length and the positions of the hyphen in the string a bit more. Besides the hyphen should only digits be allowed? — stema
– stema, Commented Sep 13, 2011 at 11:31
Yes, only digits. The exact sequence is 0000-0000-0000 (the last four digits could be 5 too. — Sbml
– Sbml, Commented Sep 13, 2011 at 11:40

stema · Accepted Answer · 2011-09-13 12:15:49Z

2

You can use preg_match and apply a regular expression.

preg_match ( string $pattern , string $TestString) See here in detail

The pattern is the problem. You need to define in detail what is allowed.

For example, the pattern:

'~^\d{4}-\d{4}-\d{4,5}$~D'

would be the whole string from start ^ to the end $. 4 digits, hyphen, 4 digits, hyphen, 4 to 5 digits.

See it here on Regexr

Update:

I added the D modifier to the end, otherwise the $ not only match to the end of the string, but also before a newline as last character in the string. See here for php modifiers in detail

edited Sep 13, 2011 at 12:15

answered Sep 13, 2011 at 11:39

stema

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3 Comments

Geert Over a year ago

Don't forget the /D modifier.

stema Over a year ago

@Geert, thank you for teaching something new. updated my answer.

Sbml Over a year ago

In this case, applying to my example, I will use FILTER_VALIDATE_REGEXP with this regular expression. Thanks for the help.

Rijk · Accepted Answer · 2011-09-13 11:19:42Z

0

Use a regular expression with preg_match(). Alternatively, you can also use sscanf() to parse the input from a string according to a format.

answered Sep 13, 2011 at 11:19

Rijk

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